This document discusses the history and origins of rock music. It notes that rock music originated from the blending of blues, country, folk and other genres in the 1950s and 1960s in the UK and US. Typical rock instruments include vocals, electric and bass guitars, drums, piano and keyboards. It also lists many subgenres that have derived from rock music over time such as alternative rock, grunge, heavy metal, indie rock and others. The document outlines some of the early pioneers of rock music like Bill Haley, Chuck Berry and Little Richard and how they helped popularize the genre in the mid-20th century.