Maybe I'll just pay Horace back by doing next Sunday's blog.
In any case, today, we get a lovely puzzle using the down answers for the theme. The revealer comes at 31D: What glows in the west at day's end ... or a hint to this puzzle's sequence of shaded squares (SETTINGSUN). It's beautifully managed, with the "sun" starting at the top and moving down three squares from east to west, finishing in the bottom three squares.
Also lovely: the word "sun" is well hidden in the non-revealer theme answers. Where possible (when it's in the middle of the phrase), it splits across two words, as in MISSUNIVERSE or MONKEYSUNCLE (love the clue here: Animal "relative" an astonished person may claim to be. Hah!). In the last example, it's hidden within SUNNIISLAM. Very nicely done.
I like that the two symmetric longer across answers are THEMESONGS and MUSICSCENE. That, along with IGOR Stravinsky, the ORGAN, and ELVIS's VIVA Las Vegas put me in the mood for some singing.
Otherwise, it's a very smooth and straightforward Monday, and a fine start to my seven days of blogging. Planned it all along.