The Beatles

In the last years of the Beatles' career, what rock artist was thought of as being the fifth Beatle?
Who designed the Revolver album cover?
Before the Beatles had recorded any of their records, they served as a backup band for an English pop singer, and cut one album with that singer. Name the singer.
Give the full first and last maiden name of John Lennon's first wife.
Who played lead guitar on the song 'While My Guitar Gently Weeps' (and it was NOT a Beatle)?
Before Ringo joined the group, two other musicians had been Beatles. What were their names?
Paul McCartney alone wrote a hit single for the Apple group Badfinger. What was the song called?
The name of the winner of the Paul McCartney Lookalike Contest appears in the lyrics of one Beatles song. What was this lucky winner's name?
The Beatles sing together with the Rolling Stones on one song. It is listed as a Rolling Stones song; name the song.
In the week of March 31, 1964, the Beatles held the #16, #44, #49, #69, #78, #84 and #88 positions on the Billboard Hot 100 chart. They ALSO held each of the Top 5 positions on the chart, a feat which has never been equalled. Name those top 5 songs. (You don't have to name them in order, but I do want to know what #1 was.)