Tunes, Improvisations, Bird Song, New Fractal Tunes, Recordings, Test my Midi player
It's in the Real Audio format. If you don't hear anything, go to this hyperlink:
Download RealPlayer (look for the free version)
Many users also like to switch off the Real Player News flashes / headline updates. To do this, uncheck them from RealPlayer | View | Preferences | Upgrade | Product flashes | Settings, and set the alert level to low in this same dialog.