| Abbreviation | Definition |
|---|---|
| NIN | Nine Inch Nails |
| NIRVANA | Needed Immediately: Reliable Vocalist, Applications Now Accepted |
| NISO | Northwest Iowa Symphony Orchestra |
| NJAB | North Jersey Area Band |
| NJB | Nabukambisi Jazz Band |
| NJCS | New Jersey Chamber Singers |
| NJCS | New Jersey Choral Society |
| NJM | National Jazz Museum |
| NJO | Naples Jazz Orchestra |
| NJO | Nashville Jazz Orchestra |
| NJO | Nebraska Jazz Orchestra |
| NJO | New Jerusalem Orchestra |
| NJP | Nancy Jazz Pulsations |
| NJS | New Jazz Standard |
| NJSO | New Jersey Symphony Orchestra |
| NJW | Nashville Jazz Workshop |
| NJW | National Jazz Workshop |
| NKM | Nils Koster Music |
| NKONTBBSB | New Kids On The Block & the BackStreet Boys |
| NKOTB | New Kids On The Block |