Add way of marking tracks as instrumental so able to create an "Instrumental" playlist, so thinking of having an instrumental field, and having a way of identifying automatically if instrumental when matched in MusicBrainz
This can now be done by using the 'Voice' attribute of Acousticbrainz, (additionally also check title)
We have instrumental field which gives a likelihood of between 1 and 100 based on values form AcousticBrainz