Chicano rock is rock music performed by Mexican American (Chicano) groups or music with themes derived from Chicano culture. Chicano Rock, to a great extent, does not refer to any single style or approach. Some of these groups do not sing in Spanish at all, or use many specific Latin instruments or sounds. The main unifying factor, whether or not any explicitly Latin American music is heard, is a strong R&B influence, and a rather independent and rebellious approach to making music that comes from outside the music industry.