Rumours of a full-fledged reunion persisted throughout the 1970s, as the members occasionally reunited for collaboration, but never with all four simultaneously. Starr's "I'm the Greatest" (1973) and Harrison's "All Those Years Ago" (1981) are the only tracks that feature three ex-Beatles. After Lennon's murder in 1980, the surviving members reunited for the "Anthology" project in 1994, using the unfinished Lennon demos "Free as a Bird" and "Real Love" as the basis for new songs recorded and released as the Beatles.