There are at least three artists named Sponge on last.fm:
i) Sponge is an alternative/post-grunge band from Detroit, formed in 1991. All of the original members, except for drummer Jimmy Paluzzi, were a part of the hard rock band Loudhouse. Drummer-turned-vocalist Vinnie Dombroski became the frontman of Sponge after their previous band's demise.
The band blew into the national music scene in 1994 with their debut album Rotting Piñata, which featured possibly their biggest hits in "Plowed" and "Molly". Read more on Last.fm