Can someone tell me what movie this song was in? Can you name the artist and year?

On this date singer Cass Elliot of the Mamas and the Papas dies of a heart attack in London.
What was the biggest song she sang on?

What is Billy Joel first No. 1 single?

Elton John’s first No.1 UK single. (On this Day)

If a unicorn could sing songs, it would sound like this male artist?
side note: No.1 is Mr. Sensitivity

What’s his biggest hit, can you name the year? I put this question forth to push a film of his That’ll Be the Day

Since I forgot how to make the change in CSIT, Go Here for List 

July 19 1986 - No. 1 Billboard Pop Hit: “Invisible Touch,” Genesis.
This Genesis artist replaced him at No.1, name the song.

First person to be awarded a Gold disc; back then it was awarded to selling one million units.

First Norwegian group to score a No.1 hit single.

What Oscar winner wrote “Mama Told Me Not to Come,” for Three Dog Night?