Touring "The Wall" has made Roger Waters a good amount of money during the past couple of years -- enough to make him the No. 2 music earner on Forbes magazine's latest list of rich musicians. Former Pink Floyd bassist Waters' haul of $88 million was second only to rap producer Dr. Dre, whose Beats By Dre headphones helped him amass a field-leading $110 million. Waters, meanwhile, was followed on the Forbes list by Elton John, who was No. 3 overall with $80 million, and U2 at No. 4 with $78 million. Also representing classic rock were Bon Jovi, No. 6 at $60 million, and Paul McCartney, No. 8 with $57 million. Check out the entire list here. Forbes tallied all of the musicians' data between May 2011 and May 2012, including physical and download sales, concert tickets, merchandise, licensing and endorsements, then subtracting management and agent commissions, legal fees and taxes.