Possible Clues:

• Imagine singer can essentially select numbers being performed
• '... a flower, you got to let it grow'
• "... a flower, you got to let it grow"
• *Musician who performed with the Plastic Ono Band
• ''Imagine'' singer
• Apostle with the French name? No, name is a famous Liverpudlian
• Only Beatle who never appeared on "Saturday Night Live"
• Beatle
• He was both Mel Torment and the Reverend Thumbs Gherkin