The Summer Crossword: A Song for Everyone

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Across
  1. 2. Caregiver, or pandemic hero? (5)
  2. 4. ____ of Sandwich (4)
  3. 7. Joe Biden's occupation (10)
  4. 9. French greeting (5)
  5. 13. Coleridge narrator (7)
  6. 14. What is to an MD, that is osteopathy is to a DO (9)
  7. 15. Bone missing in babies (7)
  8. 16. Unaccompanied (5)
  9. 20. Lie nobler (anagram) (9)
Down
  1. 1. Freud's conscience (8)
  2. 3. "My pleasure" (6)
  3. 5. Song for a professor (11)
  4. 6. Song for a crossword-solver (11)
  5. 7. Song for a math student (11)
  6. 8. Atomic-age diplomat, or type of cocktail? (7)
  7. 9. Timid (3)
  8. 10. Type of wave with very long wavelengths (5)
  9. 11. Senior clergyman (6)
  10. 12. Leech, or Oscar-winning film? (4)
  11. 17. Song for a badly-trained musician (9)
  12. 18. Killer whale (4)
  13. 19. Admit (to), with "up" (4)