Select genre as 'includes' not 'equal'

[rashley]

I tag my music with 2 or 3 genres and I'd like to be able to create a playlist on the fly by specifying genre includes 'something' rather than genre = 'something'.

For example, I might have something tagged as Electronic, Ambient, IDM and it would be cool if it showed up in random playlists when genre 'includes' Electronic or genre 'includes' Ambient or genre includes IDM.

It seems like it might be an easy feature to add.