there's been quite a few box sets with added material to the 'big' records like Sign O The Times, Purple Rain and 1999. the box sets were too expensive for me, even though I'm a big fan

there was also a famous piano rehearsal bootleg that was cleaned up digitally for official sale (1983 rehearsal or around that time, at the end you hear Prince composing a new song for about 16 minutes, they left that off the official version), a greatest hits with one 'new' track (the excellent 'moonbeam levels' track) and finally also an 'Originals' compilation where you can hear Prince sing the songs he wrote for other artists (typical example : Nothing compares 2 U)


here's one of the tracks on the forthcoming album, it was released digitally to the Prince fan club around 2010 or 2011



good track imo