The term 'Beatle in the Back' refers to two of the four members of the iconic British rock band The Beatles. The first Beatle in the back is Ringo Starr, whose 5-letter solution is RINGO. Ringo was the drummer for the band and provided backing vocals. The second Beatle in the back is George Harrison, whose 5-letter solution is STARR. George was the lead guitarist for the band and also provided backing vocals. Together, Ringo and George provided the backbone of the band's sound.