Traveling Wilburys were a surprise dream come true of a supergroup and their 1988 album, Vol. 1, was one of the best of the decade.  It pretty much brought out the best in every member and put them on the comeback trail.  Unfortunately, Roy Orbison died shortly after its release.  Still, it was successful enough that George Harrison decided to give it another go and get Tom Petty, Jeff Lynne and Bob Dylan to do a second album.  While still a quality album, Roy Orbison was sorely missed.