Happy Birthday Moses!

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Across
  1. 3. Syrian party
  2. 6. Shade of green
  3. 7. Island that shares its name with a liquor
  4. 10. In Greek mythology, this fire-breathing creature is a hybrid of lion, goat, and serpent.
  5. 12. Premier couple’s retreat?
  6. 14. Artistic contrast of light and shadow
  7. 16. Egyptian jazz musician known for pioneering the fusion of jazz with traditional Arabic music
  8. 18. Melodic framework in Indian classical music
  9. 21. Lookalike, in Munich
  10. 24. River flowing through Southeast Asia, including Cambodia and Vietnam
  11. 25. Quite some time
  12. 28. Russian Head of State before 1917
  13. 30. A Great Lake
  14. 35. Architect known for pioneering modernist design and the 'Modulor' system
  15. 37. Surreal, nightmarish, like a certain Prague-born writer's works
  16. 39. Land that split from Zanzibar in 1861
  17. 40. Tootsie treat?
  18. 41. Nomadic people
Down
  1. 1. Contemptuous sort, in modern parlance
  2. 2. Inept person, in London
  3. 4. French almond cake or City tyrant
  4. 5. One of diamond’s five C’s
  5. 8. Technological competition of the coldwar period
  6. 9. Acme
  7. 11. A city in Northern Ireland
  8. 13. Period of 'good times'
  9. 15. A tedious or difficult journey, in the Yiddish tradition
  10. 17. Previous name for Istanbul
  11. 19. Actor famous for his depiction of Hannibal Lecter
  12. 20. Something passed down the line
  13. 22. Abbrev. for someone who’s English not so good
  14. 23. West African drum known for its rich sound
  15. 26. Mathematician after which the most common Game Theory solution is named
  16. 27. Seat of power in Moscow
  17. 29. Architect known for pioneering modernist design and the 'Modulor' system
  18. 31. Nietzche’s superior man of the future
  19. 32. Idealistic but impractical, after a Spanish knight
  20. 33. Travel Restriction
  21. 34. Lowest point
  22. 36. Style of music from the biggest African nation by landmass
  23. 38. Narrow sea inlet