Amazing airpiano performance by Jo Hamilton at TEDGlobal 2011

"LastHistory allows you to analyze music listening histories from Last.fm through an interactive visualization and to explore your own past by combining the music you listened to with your own photos and calendar entries." looks good

SoundBite is the quickest and easiest way to create great-sounding playlists in iTunes. Once installed, SoundBite will get to know your music collection and when it's done, you're ready to create playlists to suit your mood.