1.
orchestra, band, musical ensemble
An organized group of musicians who perform together. Can refer to a symphony orchestra, a jazz band, a military band, or other musical ensembles.
Etymology
楽 (music) + 団 (group, troupe). Literally "music group."
Usage
楽団 is the general Japanese term for an organized musical group. More specific terms exist: 管弦楽団 (symphony orchestra), 吹奏楽団 (wind ensemble), 軍楽隊 (military band). オーケストラ (orchestra) is also commonly used for Western-style orchestras.