U2 frontman Bono took time out from the band's current Elevation Tour to fly out to Cologne, Germany last Friday (7/13) and record vocals for Mick Jagger's upcoming solo record. According to one of Jagger's talking heads, "Mick's really excited about working with Bono. They're good mates and the track is going to be amazing but he's not saying much about what it will sound like." That duet is only one of the many collaborations that Jagger will undertake for his new album. Other guests include The Who's Pete Townshend, Lenny Kravitz, Rob Thomas of Matchbox 20 infamy, as well as rapper/producer Missy Elliott.