ENSEMBLE tags in my .flac files are being displayed in Kodi as “Orchestra”. I filed a bug about this which was closed as invalid because this behavior is by design. I was encouraged to open this discussion.
I agree with the comments in the bug that this tag is for classical music and its use for, e.g, singers or rock bands is inappropriate. But even in classical music an ensemble is often not an orchestra: trios, quartets, quintets, schola cantora, etc. Whereas the generic “ensemble” can be applied to all of these and to orchestras, “orchestra” does not reasonably apply to anything else.
I suggest changing the display to “Ensemble”.