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Author Topic: Interview with Peter Marreiros of Cornerstone guitars.  (Read 487 times)
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« on: July 22, 2009, 04:47:07 PM »

Hi Folks,

For your viewing pleasure, I have just published an interview with Peter Marreiros who builds guitars under the Cornerstone name. He is best known for developing modern techniques including and all wood double top design.

As always, improvements, corrections and additional information/ your own experiences are much appreciated- I'll update the profile citing you and linking back to you! This is by no means complete a profile, so feel free to add to what I already have.

I can't link pics directly to here so do pop by to:
for the full audio/Visual presentation. As always, I present the text portion of the profile for your consideration- although I do highly recommend popping by to see the videos and pics!

I've previously missed out on video and MP3 content, but not today- let me assure you there are videos on the website.

Warmest regards,

Peter Marreiros. Cornerstone Guitars. | 2009 | Luthier Interview

TT - Thanks for taking the time for this interview Peter! I was wondering if we could start off by asking about how you came to take up lutherie as a career??

PM - Thanks Terence. Lutherie started merely as a means to get a nice guitar for myself. My first two never made it as full guitars as my high level of self-criticism didn’t see much of a prospect in them.

Things took off after that with my 3rd and 4th guitars. They sounded good and many people encouraged me and complimented my talent to match woods and colors together. So, to satisfy my latest hobby I decided to sell some in order to fuel the passion… the rest is history!

TT - Peter, did you start from a kit? Have a mentor?

PM - Well, my first two where fully “made from scratch” with the exception of the sides which I had bent by LMI but after that I made my own side bender and took off from there. I do still have a mentor and great influence in my work.

Kevin Ryan is a great friend and I have to give him credit for some of my success. There aren’t a lot of builders fortunate to have such an amazing builder as a friend. As far as craftsmanship goes the bar has been set real high as I see Kevin’s work as a benchmark of perfection.

TT - I do see Kevin’s influence in your body shape aesthetics..

PM - I have 5 guitar models I currently offer. My most popular models is the Zion and the Small Jumbo which was modeled after Jim Olson’s famous SJ.

The Zion Fingerstyle model is an original design that aimed for a larger lower bout and tight waist and Kevin’s style armrest bevel.

The Genesis is another model that I created, an Asymmetrical Jumbo. The other models are pretty much your traditional shapes, Auditorium and Grand Auditorium. Then there is the Small Concert which is still in the works….

TT - And you also craft double topped guitars? Could you let us in your construction philosophy?

PM - I started doing double tops a few years ago. I actually offer double tops and semi-Double tops both proprietary designs. My semi-double top is aimed to strengthen high figured soundboards like curly Redwood which is known to be considerably weaker than straight grained wood.

My double tops are very similar to Nomex style construction with several differences, biggest difference being that I use an all wood core rather than Nomex. I believe wood has better tonal properties and offers a more stable glue joint thus the “All Wood Honeycomb Pattern” Double Top.

TT - I take it the construction is a very involved process? How much longer does it take to build vs. a solid top?

PM -Indeed time consuming. From plate preparation to vacuum pressing that are many steps and several hours needed. Also, much more care has to be taken due to the thickness of the top plate which could easily be sanded through if one is not careful. Like bending Brazilian, there is no going back shall the unexpected arise..

TT - How do the wood choices affect the sound of double top?

PM - I make my double top tonewood choices to achieve a goal. What ever I am shooting for in a particular guitar. I believe the fundamental attributes and tone can be altered or combined by matching different soundboards. We all know there is a radical difference between Red Cedar and Adirondack, what would happen if I used both?

Would I get a warmer, more responsive top but with a bit more attack and volume? Thats exactly what I’ve been experiencing. I tend to match spruces with redwoods and cedars because I feel that delivers the tone I’m looking for by blending the best of both worlds..

TT - Okay, now’s the time to ask about back and sides woods, I guess…

PM - Terence, I believe the back and sides do play a role in the overall sound of the guitar but I’m still a firm believer that the soundboard is the biggest culprit and should get most of the credit. Sure, back and sides affect tone and volume but not nearly as much as some people give it credit for. Nonetheless, an important factor in guitar making.

TT - What are your favorites? How would you describe the various tonewood characteristics?

PM - My favorites are Brazilian Rosewood, Madrose, Camatillo Rosewood, Koa and Ebonies to name a few that come to mind. To me there is nothing like Brazilian, its like magic…. the color and grain, the crisp tone, even the smell is beautiful. Madagascar comes pretty close in my opinion but I would say the Camatillo is closer tonally, probably closer to Brazilian than Honduran Rosewood.

I also love the beauty of a nicely figured set of Koa or Tasmanian Blackwood. I could go on and give you my opinion on many tonal characteristics of various backs and sides but there are so many other important factors in a guitar that without knowing the type of guitar, soundboard, bracing patterns and specific set of wood I can only generalize…..

I would say that in my experience Rosewoods tend to offer a crisp tone with great note separation and sustain. Koa and Acacias are a bit closer to mahogany which seam to make warmer guitars with slightly less volume than Rosewood or Ebony but that would vary from set to set.

TT - Thanks for that Peter. I was wondering if you might let us in a little on your build and bracing philosophies?

PM - You’re welcome Terence. I try to get my tops as stiff and light as possible. As Kevin Ryan told me once before “weight is the enemy” and I firmly believe that and hear a difference in soundboards where measures where taken to address the issue of weight.

It is a critical part of the guitar’s fundamental structure and sound so one has to remove mass while retaining structural integrity. Lately with double tops, drilled braces and my latest “parabolic lattice Bracing” I’ve been able to reduce weight substantially and increase stiffness. I’ll let you know how it turns out as soon as I string her up…

TT - And I understand you’ve also built a Koa double top- how did that come out?

PM - Yep, I believe its the world’s first ever in Koa. It was a beautiful guitar. It sounded better than a regular Koa guitar top with a bit more bite and sustain. I will definitely do it again.

TT - Do you think the same process would work with say mahogany?

PM - Actually my intent is to make several guitars in the same way. All mahogany, all Tasmanian Blackwood and all Myrtle….when time permits.

TT - How about all spruce?

PM - I’ve seen an All-Spruce guitar 2 or 3 years ago. At this time I have no plans to do one. I think the back and sides may be too delicate…. I did think about an All-Redwood though.

TT - But isn’t redwood quite brittle?

PM - Redwood can split and tear at the end-grain but once its glued up its pretty stable. It is soft like Spruce but that’s been done before!

TT - How about double backs Peter?

PM - I have considered it but at this time I am too busy to invested the time needed in research. Maybe sometime.

TT - Any interesting projects coming up you’d like to share with us?

PM - At this time I have my first one out of a series of 7 in Olive wood on Cedar that will be making its debut at the Healdsburg Festival this August.

TT - Olive wood is rather unusual, can you tell us a little more about it?

PM - It’s pretty unusual indeed.This guitar was made after a verse in Scripture that kinda jumped out to me. So I decided to use Olive wood and Cedar to go with that verse. Olive feels a bit like Myrtle to me in texture and tap tone, if it turns out like I expect, it should be a pretty nice sounding guitar.

TT - I think that’s enough about construction- what advise would be give someone looking for a custom guitar, Peter?

PM - I think one of the best advices I can offer is to trust your Luthier. There is so much contradictory information online that can confuse the buyer and while some information may be useful sometimes the differences experienced with different guitars pertain mostly to a particular builder’s methods rather than a generalized idea. Research your tonewoods and options but do give your builder room to work, it will be for the best.

TT - Thanks Peter!

PM - Terence, thanks for taking the time. It was nice talking with you.

©2009 Terence Tan.
Pictures courtesy of Peter Marreiros ©2009
Check out Peter’s great website: link

Any infringement of copyright or errors is entirely unintentional- although we try very hard not to make them. Any guitars represented remain property of their current owners. Any issues should be address to: We will attempt to resolve these issues quickly.
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