Hlo loopers, This comes perhaps a bit late, but one top 40 group which is quite fond of loops is "Garbage". Perhaps best classified as decadent, dirty, pop songs for the slightly crooked. Another pop/rock group which has been looping since 1993 is U2. And of course drum loops are very commmon in the drum/bass genre (check out Bowie's earthling album). Enjoy your day, Bopster