Bob Mould is currently a solo singer-songwriter who also fronted Sugar and Husker Du. Mould is known for his powerful live performances and his defining role in the music that would become alternative rock. He is widely acclaimed by critics and other musicians, being cited as a major influence by such artists as Kurt Cobain and Dave Grohl of Nirvana, Greg Dulli of the Afghan Whigs, and Frank Black of The Pixies. Classic albums include Workbook and Black Sheets Of Rain.