LMP says:

The following was somehow inspired by the purchase of a thrift store dollar cassette claiming it contained Roy Orbison original recordings. Alas, it held slick mid-80's rerecordings instead. *sigh*

'Law And Orbison'/LMP edit [ 160kbps / 1:10 / 1.4MB mp3 ]

It's entirely feasible that if Roy had stuck around long enough, he would've gotten his own Dick Wolf spin-off, though he would've been the softest D.A. ever on the team.