I'll always welcome a tribute to DAVID / BOWIE. This is actually pretty darn impressive. There are five theme answers, four of them stacked in pairs, and the first word of each spells out the first line of Space Oddity ("Ground control to Major Tom..."). In addition, we get the Thin White Duke's full name (although not his given birth name, which was David Jones), AND the key of the song, BFLAT. That's a ton of theme material.
All of the theme entries are solid. I'm partial to TOMFOOLERY, as it is the title of the musical revue of Tom Lehrer's music. I had a friend when I was a kid, Sam Linsky, who knew Lehrer's music as well as I did. We sang all the songs in the back of his mother's car. I don't know how she put up with us.
With so much theme material, there is, as you can imagine, a fair amount of compromise in the fill. It's astonishing that the two long down answers that cross three theme entries are so good: IPODNANO and TABLOIDS. IMODIUM not so much, because it's both a brand name and it treats grossitude.
IHEARYA is great. NUMLOCK I didn't love. Crosswordese includes EBAN, OMAHA, IDED, ILIA.
1A: Hearty har-hars (YUKS) - hmm. I like the clue, and the answer is unusual. I'll give it a B.
Favorite clue-answer pair is 51D: They may be blown by a magician (MINDS). Had all kinds of thoughts running through my own mind with that clue. Second favorite clue is 65A: The duck in "Peter and the Wolf" (OBOE). Great music.
I forgive any issues with the fill for Mr. Bowie's sake.