Art rock (also sometimes called progressive rock or classical rock) is a sub-genre of rock music that has "experimental influences". It tries to make rock music into art instead of just entertainment. It often uses longer songs than other genres of rock. It uses different techniques such as elements (parts) of classical music. It is not usually music to dance to, but music to just listen to. It started in the 1960s. Phil Spector (an American music producer) and Brian Wilson (the leader of The Beach Boys) are two early examples of musicians making art rock. The genre was popular with British bands at the end of the 1960s and the beginning of the 1970s.