go to http://excite.com/ , choose audio and search for whatever song u like. u can download 'em for free. i've been doing tht for some time and good thing is u can download it from any hotspot(wifi connection avalible), and take it anywhere and listen. but u have to be careful cuz not all files are mp3 and some of 'em are streaming mp3s and u can't open streaming song. so when u've found a song tht u search, make sure it has file size, attribute is mp3, duration is somewhat reasonable, than click on it and u can download it into psp directly. another thing to be careful is when u download, if psp choose to save the file in psp/common, than u r downloading a wrong file with different attribute, not mp3. but if psp choose psp/music, than u r fine. so good luck.........

p.s. sometime u can listen to other attribute such as midi or wave by changing their name to end with .mp3 and changing the directory to psp/music. again good luck