Surf music is a subgenre of rock music associated with surf culture, particularly as found in Southern California. It was especially popular from 1962 to 1964 in two major forms. The first is instrumental surf, distinguished by reverb-drenched electric guitars played to evoke the sound of crashing waves, largely pioneered by Dick Dale and the Del-Tones. The second is vocal surf, which took the original surf sound and added vocal harmonies backed by basic Chuck Berry rhythms, a movement led by the Beach Boys.