Publishers – R
- R.Schroor
- Radio Corporation of America
- Raw Percussion Publications
- Read Books
- Real Musical
- Really Useful Group
- Reba Productions
- Reclam Verlag
- Red Poppy Music
- Reed Music
- Reedimensions
- Registry of Guitar Tutors
- Registry Publications
- Reiskmore Music
- Resonata Music
- Rhinegold Publishing
- Rhythm MP
- Richard Strauss Verlag
- Richard van Rijswijk
- Ricordi
- Right Recordings
- Right Turn
- Rilting Music
- Rittor Music
- Riverberi Sonori
- RMH
- Road Rock International
- Robert King
- Robert Lienau
- Robert Martin
- Robert Smith & Co.
- Roberton Publications
- Robin Reed
- Rock House Method
- Rock School Limited
- Rock Valley Music
- Rocket Gifts
- Rockstarz
- Ron Harris Music
- Rondo Publishing
- Rondor Archive
- Rondor Music International
- Rosehill Music
- Rosenzopf Musikverlag
- Rossleigh Music
- Rotosound
- Row-Loff Productions
- Rowman & Littlefield
- Royal School of Church Music
- Rózsavölgyi és Társa
- Rubank Publications
- Rudolf Steiner Press
- Rued Langgaard Edition
- Rugginenti Editore
- Ruh Music
- Runa Nototext
- Running Press
- Russian Music Publishing
