No, actual music. Stone would sound stupid. Even if you drop a few of them on the floor at the same time they still just kind of go 'DUNK'.
According to another site these songs have been identified:
Creedence Clearwater Revival 	Fortunate Son
Wagner 	Ride of the Valkyries
Wolf People 	Village Strollin'
Jack Arel 	Picture of Summer
Jack Arel 	Strange Galaxy
Jack Arel 	L'Amour Et L'Enfer
John O'Brien-Docker 	Freak Out
John O'Brien-Docker 	Sock it to Me Baby
Pierre Dutour & Jack Arel 	Bewilderment
Anders Lewen 	Muscle Soul
Anders Lewen 	Memphis Guitar Soul