[I think we're looking for the Venn diagram of "well-known," "not too wordy," and "has some interesting harmonies or high notes that people will want to attempt," I think.]
A few early suggestions:
- "You've Lost That Loving Feeling"
- "Lean On Me"
- "I Want It That Way"
- Most of the Grease soundtrack, but especially "You're the One That I Want"
- "Take On Me"