I thought that French major was going to finally pay off today when I dropped in LEPETITDEJEUNER (17A: *Breakfast, in Burgundy) without a second thought, but then when I came to EINEKLEINE NACHTMUSIK (Mozart composition), I briefly panicked because I first defaulted to the Dutch spelling of music (muziek), which did not fit! And then the Spanish in the middle was where I ended up, because although I - and everyone else in the country - has heard "La Bamba" countless times, I never distinctly heard UNAPOCADEGRACIA in the lyrics, so I needed a little bit of grace to finally get the answers to 30D: Good-news-to-bad-news transition (BUT) and 39D: Listen here! (EAR), both of which were amusing in the end.
1A: Hairdressers' challenges (MOPS) - B. Good clue, unusual term.
Favorite: IAMSODEAD (32D: "OMG, my parents are gonna ground me forever!") - LOL
Least: I guess RIAA (68A: Org. certifying albums as gold or platinum), because it's an obscure abbreviation, but honestly, it's not all that bad.
I really liked this puzzle. I'm a big fan of languages, and in addition to the theme answers, we have ECLAT (8A: Brilliance), CRU (9D: French vineyard), BRIO (30A: Vivacity), OLES (34A: Corrida cheers) (ok, this plural of tired crosswordese probably should have been my least favorite), DES, OPEL, and the names ARP, MEHTA, and KANT.
Other highlights for me include SHIRK (55D: Avoid, as work), ELM (22A: One throwing shade?), III (38D: XXX divided by X) (there have been a string of good clues for III lately, in my opinion), and SHOAL (60A: Boating hazard).
Hey, this puzzle is one place where GLUE is not glue... and is EENIE a duplication with EINE?
p.s. And hey, it's a debut! Congratulations, Mr. Mauer!