| Abbreviation | Definition |
|---|---|
| SEPO | Syrian Expat Philharmonic Orchestra |
| SESAC | Society of European Songwriters Artists and Composers |
| SESBA | Southeastern Shrine Band Association |
| SET | Solid Electric Through-neck guitar |
| SEX | Scientific Experimental Xylophone |
| SEX | Symphonic Ensemble of Xylophones |
| SEYO | Sistema Europe Youth Orchestra |
| SFA | Super Furry Animals |
| SFCCO | San Francisco Composers Chamber Orchestra |
| SFCM | San Francisco Conservatory of Music |
| SFCO | San Francisco Chamber Orchestra |
| SFCO | Santa Fe Community Orchestra |
| SFDH | Society of Folk Dance Historians |
| SFDR | Spurious-Free Dynamic Range |
| SFE | So Fresh Entertainment |
| SFH | Squirrels From Hell |
| SFH | Sweatshirt Fetus Head |
| SFIM | San Francisco Institute of Music |
| SFL | Skarred For Life |
| SFM | Special Favorite Music |