(Saturday, January 4, 1975) — “Lucy in the Sky with Diamonds” by Elton John (written by John Lennon and Paul McCartney of The Beatles and featuring backing vocals and guitar by Lennon) peaked at #1 on today’s Billboard Hot 100 singles chart for two consecutive weeks (Jan. 4/11, 1975). It was John’s third of nine number one hits on the chart (1973-1997).