Grant Hart, the co-founder, drummer and singer for the seminal indie band Hüsker Dü, has died at age 56, Variety reported Thursday. He had recently been diagnosed with cancer. Hart formed the Minneapolis band with fellow singer-songwriter Bob Mould and bassist Greg Norton in 1979, becoming pioneers of the American independent-rock movement of the 1980s. The singer went on to have a successful solo career after the band split in early 1988. He also led the band Nova Mob.