| Abbreviation | Definition |
|---|---|
| IMRO | Irish Music Rights Organisation |
| IMSO | Interactive Music Simulation Organization |
| IMSP | International Music School of Provence |
| IMT | Independent Music Teacher |
| IMT | Institute of Musical Traditions |
| IMTA | Indiana Music Teachers Association |
| IMTA | Iowa Music Teachers Association |
| IMV | independent Music Videos |
| IMW | Intonation Music Workshop |
| IMWT | In Music We Trust |
| INSOC | Information Society |
| INTW | Into the New World |
| INXS | in-ex-ESS |
| INYT | I'm Not Your Toy |
| IO | Insatiable Ouroboros |
| IOCW | Illinois Orchestral Conducting Workshop |
| IOF | Ice Of Fire |
| IOJ | Indonesia Open Jazz |
| IOM | Internet Of Music |
| IOML | Inventory of Orchestra Music Libraries |