These orchestras soon started to lose popularity as new rock bands appeared, formed by young musicians who mostly covered American and British songs. Los Lunáticos, founded in 1956, are considered by many to be the first Mexican rock and roll band, and later other bands like Los Locos del Ritmo, Los Rebeldes del Rock, Los Teen Tops, etc. became popular. Las Mary Jets, formed in 1959, were the first all-female rock band in Mexico. Rock, as elsewhere, became tied with the youth revolt of the 1960s.