| Abbreviation | Definition |
|---|---|
| GBGH | Go Big or Go Home (Song - American Authors) |
| GBH | Great Britain Hardcore |
| GBMB | Golden Buffalo Marching Band |
| GBP | Gay Band Party |
| GBS | Greater Bridgeport Symphony |
| GBSM | Graduate of the Birmingham School of Music |
| GBSM | Graduate of the Birmingham School of Music (Birmingham UK). |
| GBYM | Get Back Your Music jam sessions |
| GC | Gain Control |
| GC | Good Charlotte |
| GC | Grand Concert |
| GCCB | Glenorchy City Concert Brass |
| GCCB | Gloucester Charter Concert Band |
| GCCB | Greater Columbus Concert Band |
| GCCB | Greenville County Concert Band |
| GCCC | Grand Cities Childrens' Choir |
| GCCO | Greenville Community Chamber Orchestra |
| GCCO | Guitar Circle Colorado |
| GCCO | Gulf Coast Chamber Orchestra |
| GCCW | Grove City Community Winds |