User: Among rock musicians of the late 20th century, tell me which of the following are singers or drummers: Bon Scott, Tommy Lee, Sebastian Bach, Robert Mason, Phil Rudd, Alex Van Halen, Mick Brown, Klaus Meine, David Lee Roth, Rob Halford
Assistant: Bon Scott - Singer
Tommy Lee - Drummer
Sebastian Bach - Singer
Robert Mason - Singer
Phil Rudd - Drummer
Alex Van Halen - Drummer
Mick Brown - Drummer
Klaus Meine - Singer
David Lee Roth - Singer
Rob Halford - Singer