The Byrds were an American rock band formed in Los Angeles in 1964 who pioneered the folk rock genre and became one of the most influential groups of the 1960s. Known for their innovative use of electric guitars and intricate vocal harmonies, they produced iconic hits like "Mr. Tambourine Man," "Turn! Turn! Turn!," and "Eight Miles High." The band's evolution from folk-rock to psychedelic and country rock helped shape the sound of rock music for generations to come.