From Rocklopedia Fakebandica
Josie and the Pussycats. They sing the songs "Backdoor Lover" and "DuJour Round the World" (both on the soundtrack album). They all get killed in a plane crash when they learn THE HORRIFYING TRUTH!
Lineup: D.J. (Donald Adeosun Faison), Travis (Seth Green), Marco (Breckin Meyer), and Les (Alexander Martin). Their evil manager was Wyatt Frame (Alan Cumming). Official Site.
See also Josie and the Pussycats.