Soul artist Sisquo--the Dru Hill frontman whose debut solo album, "Unleash the Dragon," has sold more than three million copies--will occupy a slot on 'N Sync's summer tour. Sisquo's single "Thong Song" is currently the most-played song on MTV, according to his publicist.

'N Sync's sold out tour runs May through July.

Sisquo also performs on VH1's ''Men Strike Back'' concert, which airs Tuesday (4/18). Other performers include Sting, Backstreet Boys and Enrique Iglesias.