tomfrickery, II

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Across
  1. 4. Glossy 2010's aesthetic
  2. 5. Comprehensive; widespread
  3. 6. Famous demon barber, in musicals
  4. 8. "Just so you know...", in texting shorthand
  5. 13. Top keyboard layer
  6. 15. "Avengers: ..." (2)
  7. 18. Trick question?
  8. 19. Carnation genus
  9. 21. Sailor man in famous radio show
  10. 23. The J in JRR Tolkien
  11. 25. [Intact]
  12. 27. 2008 video game featuring a keyboard-controlled runner
  13. 29. "Old news", "naturally artificial", e.g.
  14. 30. A bunch of baloney
  15. 32. Phone brand whose name loosely matches a US state
  16. 34. Popsicle or cocktail
  17. 35. Facebook relationship status
  18. 38. Omnipresent
  19. 39. Running out of ____ (late)
  20. 41. "Let me know about it"
  21. 42. "What ____ in here?" ("This place reeks!")
  22. 43. Dot-dash-dot
  23. 46. Type of pasta
  24. 47. Let that ______
  25. 48. Spaceship-driving video game character Fox
  26. 51. Publicly support
  27. 52. Open question?
  28. 53. "Quit that!"
  29. 55. "Avengers: ..." (1)
  30. 56. Initiating conversation, or what the bracketed clues have in common
  31. 57. Greatest work
  32. 58. Infidelity
Down
  1. 1. Phone brand named after fruit
  2. 2. What O stands for in EGOT
  3. 3. Obsolete term, meaning to the eighth power of
  4. 7. For the world to see
  5. 9. Choosing chant
  6. 10. Work collection
  7. 11. [Five member Canadian R&B group]
  8. 12. Surveillance apparatuses, shortly
  9. 14. Preceder of "open the gate", in children's playground sayings
  10. 16. Replicating olden times
  11. 17. _____ of one's eye
  12. 20. Apple media player built-into macOS
  13. 22. Dubbed "the magical fruit"
  14. 24. "Easy!"
  15. 26. Apple product whose ads featured dancing silhouettes
  16. 28. Tolkien book
  17. 31. Part of the scientific method
  18. 33. Burning question?
  19. 36. How many days in a month, occasionally
  20. 37. "Here's something to think about"
  21. 40. [Lack of caution]
  22. 44. Washington Post's weekendly crossword special
  23. 45. [Before the matter]
  24. 49. "Filmed in front of a live ______ audience"
  25. 50. Troubled orphan, in musicals
  26. 54. Period of activity, slangily
  27. 56. James, who produced "You're Beautiful"