Across

1. Theory that answers the question “What’s the matter?”

8. Odd

15. Crescent-shaped opening

16. Opine

17. Add bit by bit

18. Crusade

19. “Misery” Oscar winner

20. Bone marrow lymphocyte

22. Lynyrd Skynyrd’s “Working for __”

23. “What __ state of affairs!”

24. Nice pen

25. 1970 A.L. MVP Powell

26. Pester

27. More than lift

28. Air ending

29. Odd

31. Grand array, maybe

32. Inexpensive way to travel

34. Female Indy racer __ Patrick

37. Secures, in a way

41. Radarange maker

42. They’re tender

43. Prefix with angular

44. With 36-Down, 1925 Broadway hit

45. Lots

46. “__ ‘70s Show”

47. Sr.’s hurdle

48. It has regular drawings

49. “The results __”

50. Some cosmetics

52. German narrative genre

54. “CHiPs” star

55. Philippines city

56. Fails to

57. Landlords

Down

1. Storied woodcutter

2. Deli order

3. Performing

4. Distributed, with “out”

5. “No kidding?”

6. 2004 N.L. champs

7. His epitaph reads, “That’s all, folks!”

8. Plot

9. Oar’s fulcrum

10. Stream

11. Poet Lowell

12. Dark phase

13. 2005 Kentucky Derby winner

14. Causes to explode

21. Ruthless

24. Montana motto word

25. “... among thy green __”: Burns

27. Writer Jong

28. Some retaining walls

30. One might be charging

31. Singing voice, informally

33. Like pituitary gland functions

34. Hung loosely

35. Spanish sherry

36. See 44-Across

38. “I kissed thee ere I killed thee” speaker

39. Not so hardy

40. Exercise goal

42. Attacks

45. Lively movement

46. Palms, e.g.

48. Bridge __

49. Sports pg. listings

51. Taxing letters

53. “A Chorus Line” song