Initially, the Byrds pioneered the musical genre of folk rock as a popular format in 1965, by melding the influence of the Beatles and other British Invasion bands with contemporary and traditional folk music on their first and second albums, and the hit singles "Mr. Tambourine Man" and "Turn! Turn! Turn!". As the 1960s progressed, the band was influential in originating psychedelic rock and raga rock, with their song "Eight Miles High" and the albums "Fifth Dimension" (1966), "Younger Than Yesterday" (1967) and "The Notorious Byrd Brothers" (1968). The band also played a pioneering role in the development of country rock, with the 1968 album "Sweetheart of the Rodeo" representing their fullest immersion into the genre.