The most passionate fans in music are the hardcore fans of Rock & Roll. Those fans turn out in huge numbers whenever a big rock band goes on-tour, including: Dave Matthews Band, Fleetwood Mac and the Rolling Stones. Encompassing some of the biggest acts in music, there is something for everyone. The genre spans generations including bands like Foo Fighters, U2, and Aerosmith. Each year many of the highest grossing concert tours are Rock bands. Similar genres to Rock include: Adult Contemporary, Alternative & Pop.