Rock is perhaps best known as a producer for bands such as Metallica and Mötley Crüe. He has also worked with Aerosmith, Bon Jovi, Cher, The Cult, David Lee Roth, Skid Row, Veruca Salt, Nina Gordon, The Offspring, 311, Our Lady Peace, The Tragically Hip, The Tea Party, Lostprophets, American Hi-Fi and Simple Plan. Rock briefly returned to performing, forming the band Rockhead with ex-Payola$ drummer Chris Taylor. The band released one self-titled album and two singles before splitting up. Rock produced the five finalist songs of CBC Sports's Hockey Night in Canada Anthem Challenge in late 2008. Controversy erupted when it was discovered that one of the winning entrants had a working relationship with Rock.