Grooveshark is a super cool music streaming site and it allows you to embed the songs you like in our website !
Now moving on how to embed the songs . Open up the song you like to embed (or play it ).
Example link :http://grooveshark.com/s/Hold+My+Hand+Feat+Akon/3nQb6g?src=5
Now play the song and select this
This widget has ALL of mj's songs . Give it a try :)