[HeXetic]

> So at any point, you could select an artist and see both their albums and tracks. Or you could select no artist and see all albums and all tracks. You could select an album there and see all tracks in that album. You could pick a track from the full list, etc.

iTunes does this on the desktop. It shows up as filter panes at the top of the master tracks list, allowing you to narrow the list by selecting one or more genres, artist or album. And selecting items from any of those filter lists narrows the other lists accordingly (e.g. select an artist and it reduces the albums list to the albums they own or appear on and the genres list to only those genres in the filtered tracks).