Often considered the most influential band of the rock era, the group's music pioneered new recording techniques and was primarily responsible for pop music's evolution into an art form. The band also recorded several songs that remain unreleased. Since their break-up, over 100 more songs by the group have been officially released, which include live songs the group never recorded in the studio and numerous outtakes. The group's 'main catalogue'-songs released between 19-consists of 213 songs (four of which exist in different versions): 188 originals and 25 covers. The Beatles were an English rock band from Liverpool who recorded hundreds of songs during their career. L–R: John Lennon, Ringo Starr, Paul McCartney and George Harrison.