A1. Aria man, maybe ~ BASSO

A6. Nursery word ~ MAMA

A10. "Times of Your Life" singer ~ ANKA

A14. Sound eliciting a blessing ~ ACHOO

A15. Gabonese president Bongo ~ OMAR

A16. Get an understanding of ~ READ

A17. Obfuscate ~ CLOUD

A18. Flummox ~ DAZE

A19. It might be made of corn ~ MAZE

A20. Flies ~ HURTLES

A22. Thing that can be very sticky? ~ DAM

A24. With 28-Across, 1935 nominee for Best Picture ~ TOP

A25. See 73-Across ~ THESQUAREROOT

A28. See 24-Across ~ HAT

A30. AT&T Center player ~ SPUR

A31. Runnin' Rebel opponent, maybe ~ UTE

A32. They can be fragile ~ EGOS

A34. Collar ~ NAB

A35. Blowhard ~ GASBAG

A39. Lets out ~ RENTS

A41. Morse morsel? ~ DAH

A43. Denis of "The Ref" ~ LEARY

A44. Mississippi River discoverer ~ DESOTO

A46. Holiday drink ~ NOG

A48. Coal car ~ TRAM

A49. Led ~ RAN

A50. Unit of potential difference ~ VOLT

A52. Former Manhattan punk music club, familiarly ~ CBS

A53. See 73-Across ~ OFNEGATIVEONE

A58. Where monkeys go bar-hopping? ~ ZOO

A59. WWII battle zone ~ ETO

A60. Signs up ~ ENROLLS

A63. Air France airport ~ ORLY

A65. Qatari potentate ~ EMIR

A67. Deuce follower, sometimes ~ ADOUT

A68. 2008 All-Star center fielder McLouth ~ NATE

A69. Son of Solomon Levy in an Anne Nichols play ~ ABIE

A70. Word on Pooh's pot ~ HUNNY

A71. Hurricane centers ~ EYES

A72. "___ on Entebbe" (1977 TV movie) ~ RAID

A73. What to do to all the letters in this puzzle's grid hinted at by 71-Across to create the symbol described by 25- and 53-Across ~ SHADE

D1. "Coffee" Cantata composer ~ BACH

D2. Org. that helped defend John Scopes ~ ACLU

D3. Cargo measures ~ SHORTTONS

D4. Part of NSW ~ SOUTH

D5. Gobs ~ OODLES

D6. 1999 Claire Danes film, with "The" ~ MODSQUAD

D7. Org. with interns and internists ~ AMA

D8. Protegé maker ~ MAZDA

D9. Bearskin, perhaps ~ AREARUG

D10. Recliner part ~ ARM

D11. "Swell!" ~ NEATO

D12. Easy-to-play instrument ~ KAZOO

D13. Masterful ~ ADEPT

D21. Channel owned by Disney and Hearst ~ ESPN

D23. Motörhead genre ~ METAL

D26. Pope during the Great Schism ~ URBANVI

D27. Make all zeros ~ RESET

D28. Rustler's target ~ HERD

D29. "The African Queen" co-screenwriter ~ AGEE

D33. Put away ~ STORE

D36. Host of the 1992 Summer Olympics ~ BARCELONA

D37. Breed of steed with speed ~ ARAB

D38. Court buildings? ~ GYMS

D40. Play place ~ STAGE

D42. Did some work as a char ~ HOOVERED

D45. Running wild ~ ONATEAR

D47. Secluded valley ~ GLEN

D51. Sacred scrolls ~ TORAHS

D53. UV ray absorber ~ OZONE

D54. Venture ~ FORAY

D55. Jefferson portrayer in "Jefferson in Paris" ~ NOLTE

D56. Olympic skiing gold medalist Alberto ~ TOMBA

D57. "Well, obviously!" ~ NODUH

D61. Bergman's "Casablanca" role ~ LUND

D62. Problem treated by an ophthalmologist ~ STYE

D64. "Signs point to ___" (Magic 8 Ball message) ~ YES

D66. Number the minute hand points to at quarter past ~ III