Theme: Lend Me Your Ears.
17. High-tech bookmark : INTERNET ADDRESS
28. Office gossip : WATER COOLER TALK
48. Right granted in the First Amendment : PROTECTED SPEECH
62. "Et tu, Brute?," e.g. : FAMOUS LAST WORDS
Melissa here. Love the four grid-spanners. No reveal clue today, but it's hiding in the answer to 62A. Very clever.
Across
1. One in a bad mood : CRAB
5. Diplomat's asset : TACT
9. Vatican-related : PAPAL
14. Memorization method : ROTE. Repetition.
15. Patron saint of Norway : OLAF. Not Olav.
16. Nimble : AGILE
20. African language group : BANTU
21. Winter bug : FLU
22. Cupid's counterpart : EROS
23. Safari beast : RHINO
26. Mystery writer whose Baltimore home is preserved as a museum : POE
35. Moved quickly, old-style : HIED
36. Meat inspector's org. : USDA
37. "Awesome!" : ZOWIE. Stumped me.
38. Office coffee holder, perhaps : URN
39. Hard-rock link : AS A
40. "O Sole __" : MIO. "The sun, my own sun."
42. 1965 march state: Abbr. : ALA
43. Gold or silver : METAL
45. Rainbow flag initialism : LGBT
47. Gillette's __ II razor : TRAC
51. Bubbly prefix : AER. Aerate.
52. Clapton classic : LAYLA
53. Gem from Australia : OPAL
56. Private eye : TEC. DeTECtive.
58. Go around in circles? : ORBIT
66. Pat down : FRISK
67. Inbox clogger : SPAM. NOAA discovered this perfectly preserved can of SPAM resting at the bottom of the ocean (4,947 meters) on the slopes of a canyon leading to the Sirena Deep in the Mariana trench.
68. Pamplona parlor : SALA. Spanish, a large room or hall to entertain guests.
69. Sight or hearing : SENSE
70. Wine city near Turin : ASTI
71. River of central Germany : EDER
Down
1. Bed with sliding sides : CRIB
2. Author Jaffe : RONA
3. Mail-routing abbr. : ATTN
4. Obviously embarrassed : BEET RED
5. Weigh station unit : TON
6. Pub offering : ALE
7. Science Diet product : CAT FOOD
8. Nonstick kitchen brand : T-FAL. French cookware - portmanteau of TEFlon and ALuminum.
9. Sketching tablet : PAD
10. Shake hands on : AGREE TO
11. Harbor strolling spot : PIER
12. "One more thing ... " : ALSO
13. Not as much : LESS
18. Industrial area of western Germany : RUHR
19. Play for a sucker : DUPE
24. Post-op areas, briefly : ICUs. Intensive Care Units.
25. Margarita option : NO SALT
27. Ricelike pasta : ORZO
28. Sound of a tree falling, say : WHUMP
29. Broadcaster : AIRER
30. __-one: long odds : TEN TO
31. Kappa follower : LAMBDA
32. Informed (of) : AWARE. I wonder why the (of) is needed here - since of could also follow AWARE.
33. Pale purple : LILAC
34. Stacy who played Mike Hammer : KEACH
39. Out of the wind : ALEE
41. "The __-bitsy spider ... " : ITSY
44. Completely flummoxed : AT A LOSS. I often hear "I am lost for words," instead of "I am at a loss for words." Doesn't make sense to me.
46. Easy-to-swallow meds : GELCAPS
47. Flowering hybrid with thorns : TEA ROSE. Wikipedia: Hybrid tea is an informal horticultural classification for a group of garden roses. They were created by cross-breeding two types of roses, initially by hybridising hybrid perpetuals with tea roses.
49. Phased-out PC screens : CRTS. Cathode Ray Tubes.
50. Farm machine : PLOW
53. Does in, mob-style : OFFS
54. Whittle (down) : PARE
55. Idi of Uganda : AMIN
57. Big cat of film : ELSA
59. Actor Pitt : BRAD
60. Vegging out : IDLE
61. Many an Ivan, in old Russia : TSAR
63. Lute kin : UKE
64. Gained a lap? : SAT
65. "No more deets!" : TMI. "Too much information!" (Deets=details.)