The Beatles release Yellow Submarine
Yellow Submarine is a soundtrack album released by The Beatles corresponding with the film of the same name released on Apple Records (catalogue number PCS 7070 in the United Kingdom and SW 153 in the United States.)
In contrast to how the film was received, Yellow Submarine is usually considered The Beatles' weakest release, as it featured only six songs by the band. It was one of the few Beatles releases not to reach #1 on either the UK or US charts. Its highest position was #2 in the US (curiously, it was knocked off the top by The Beatles, which had been released two months before). The Beatles did not consider it a studio album, since the four previously-unreleased tracks on it were recorded at various times in 1967 and early 1968.