Keynote Pianoworks

Piano tuning, repair, and restoration services in Charleston, SC


our expertise


We use a hybrid aural and electronic tuning method and stay up to date with the cutting edge of tuning practice.


Our fully equipped woodworking shop allows us to tackle a wide range of repairs for your piano.


Restoration projects are customized to meet your needs and performed locally in the Charleston area.

Full service piano technician

Hand-crafted excellence

Blending traditional hand-tool techniques with a modern perspective, where timeless artistry meets contemporary sensibilities.

Embracing tradition

Each instrument’s history and design are considered to elevate its performance and sound. Historical tunings are available upon request.

Complimentary consultation

Consultation and evaluation for any repairs, reconditioning, or restoration are complimentary for every project.

Piano Technician’s Guild member

Proud to be a member of the Savannah–Charleston and Palmetto chapters of the Piano Technician’s Guild.

Fall back in love with your piano

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services offered


Adjust the tension of each piano string to bring it to the correct pitch. Recommended every 6 months or sooner.


Fine tune each key mechanism to even out touch response. Major regulation recommended every 5–10 years.


Manipulate piano hammers to mellow or brighten tone and increase tone control. Recommended every 3–5 years.

Key Restoration

Revitilize the keyboard with fresh new keytops. In some cases, old ivory keytops in good condition can be preserved.

Finish Repair

Hide or remove scratches, water damage, and other blemishes from the piano’s finish. We repair both traditional and polyester finish.


Thoroughly clean action and replace all felts as necessary to bring the instrument back to peak performance.


Milton Upright, 1916 (Ongoing)

Milton Upright, 1916 (Ongoing)

1916 Milton - Removing the Tuning Pins

1916 Milton - Removing the Tuning Pins

Story & Clark Upright, 1895-1900 (Ongoing)

Story & Clark Upright, 1895-1900 (Ongoing)

Polyester Finish Repair, before & after

Polyester Finish Repair, before & after

Finish Repair, before & after

Finish Repair, before & after

Wood Repair, before & after

Wood Repair, before & after

Refelting, before & after

Refelting, before & after

meet the owner

Mathias Walters

Mathias Walters

Owner, Lead Technician

Mathias is a pianist and woodoworker with a passion for antiques. In addition to his work with pianos, he maintains a collection of antique hand tools, many of which are actively used in the day-to-day operations of his shop.

service appointments

Basic Service

$160/ service

  • 1½–2 hours
  • fine tuning
  • light cleaning
  • maintenance & repair advice
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Full Service

$240/ service

  • 2½–3 hours
  • fine tuning
  • comprehensive maintenance
  • minor repairs
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Revive & Renew

$380/ service

  • split in-home & in-shop
  • fine tuning
  • hammer resurfacing & alignment
  • minor & some major repairs
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FREE/ service

  • restoration planning
  • water damage evaluation
  • finish damage evaluation
  • $60 pre-purchase inspection
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Daulton Hagan

Feb 2024

Very knowledgeable and professional!! Great tuner and knows what he is doing! Definitely would recommend!!

Charles Crane

Jan 2024

Mathias is extremely skilled at his trade. He was very detailed oriented and focused. I greatly appreciate him letting me pick his brain about the inner workings of our piano and his methods of tuning. Highly recommend to anyone in the Charleston area!

Donna Whinnery

Nov 2023

Mathias was great in communicating to setup tuning & provided excellent service on my baby grand.

Gil Trevino

Oct 2023

Great job, explained the issues found and was very upfront and honest about what needs to happen moving forward. Would highly recommend.

James McKinney

Jun 2023

On time, professional, very accurate and thorough.

Sarah Delia

May 2023

Mathias was professional and competent and took great care of our Boston grand piano! I will definitely contact him for the next tuning!

Emily Evans

Dec 2022

Mathias is incredibly professional and helpful. He takes the time to explain his process and recommendations for future care. He has helped to restore my grandmother’s piano to be playable again and for that I am very grateful!

Jay Winnerman

Mar 2022

Mathias is excellent—my piano has never sounded so good! Took his time to make sure that it was perfect sounding! Very nice and professional as well. I would highly recommend M. Walters Piano Services to any and everyone!!

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contact us

contact details

North Charleston, SC
Phone: (843) 619-7593