Here is a basic tutorial:
Download Ditty Importer, and import ur mp3s and if would be made .asf files, from there u just rename the songs to xsong1, xsong2, etc...
Copy the songs from the folders u made the songs in, and trasfer it over to audio-music... Replace songs. Ur done! Open up live and enjoy! Check
http://forums.nba-live.com/viewtopic.php?t=53962 for more info and wat songs u want to replace! R we good