Comment 5 for bug 1402133

Dunno if it warrants a separate bug or not, but this could be extended to a history: tag, to filter in the past sessions views. E.g.:

crate:hip-hop -history:2014,15-31

To get all hip-hop that I *didn't* play in late December (i.e. tracks that aren't in any sessions between that time). Could be really useful for anyone with a regular gig: it'd be an easy way to make sure you're not getting too repetitive.

Might work better with some boolean operations:

crate:hip-hop -(played-after:2014-15 AND played-before:2014-31).

Not sure if there is a concise syntax for this, but you get the idea.