The developer plum has released a new version of its very useful MP3 Player plugin, which comes now in version 1.8. This plugin will allow us to 'listen to our favorite music while playing, while surfing the net or even just in the XMB.
CHANGELOG OFFICIAL mp3Player Plugin v1.8:
Controls:
L + R + START = on / off Hold
L + R + [] = Play / Pause
L + R + O = switch to playback mode
L + R + → = next song
L + R + ← = previous song
L + R + up / down = volume control
UL: http://ul.to/d49itruc
MU: http://www.megaupload.com/?d=YKABJEDW
Source: plum's twitter