Thats long to explain but Ill tell you.
Go to user CP
Then on the left there should be something that says Widget Manager
Click that and then it will give you another link that says Manage your Widget
Click on that and it should show you Some Widgets
Get the MP3 widget (It is the black and red one)
Then open another tab or page and go to
Project Playlist | Myspace Playlist | Create, Share Music Playlists | Music Playlist || Facebook Playlist, Tagworld, Stickam, Hi5, Gaia, Friendster, Xanga, Myspace Music Player, Myspace MP3 Player/Players, Facebook Music Playlist, Myspace Music Playl
And there should be a search engine, Search the Song And When the song you want comes out press the play button so you know it works well.
Then there should be something that says Visit Site,
Click on that and There should be a link in green
Copy it and then go back to the widget
And paste under the music url.
And then Click get widget and saves by itself :P