UnScramble this Word: i e r s e i m s?

Questions

What was the Supremes' original name?

What was Sly and the Family Stone's first No. 1 song?

The Beach Boys recorded surfing music like 'Surfin Safari', 'Surfer Girl' and 'Surfin USA'. Name the only Beach Boy who actually surfed?

According to Elton John, what time is 'Zero Hour' in the song 'Rocket Man'?

What did Janis Joplin drink on stage during concerts?