Solved this with Frannie while we sat around with Huygens et uxor drinking coffee. The theme of concatenated band names is pretty well done. I guess I'm familiar with all the bands, now that I've looked up "Free."
At first I didn't realize that it was two band names in each answer, because CHICAGOTRAIN seemed perfectly reasonable for 22A: Elevated sight in the Windy City, well, all of them seem perfectly reasonable, come to think of it, which makes this quite a likable theme. The bands skew a little old, but that works well for this reviewer. YESNODOUBT (55A: "Absolutely!") might be the most unnatural, and EAGLESWINGS (62A: They're seen spread on the back of a quarter) is slightly marred by all the specialty quarters that have come out in the past few years. When is this constant changing-of-coin-designs fad going to stop? Can't we just have standard coins? Sheesh!
Some of the fill is a little GENERIC, like REMAIL (25A: Forward, as a letter) and ONHIRE (20A: Available, as a London limo), and I don't particularly love NEONATES for 120A: Newborns, but it's balanced by bits of crossword ELEGANCE like PRIMROSES (3D: Early spring blooms), ISAACNEWTON (67D: Who said "Aristotle is my friend - but my greatest friend is truth"). 27D: Something bound to sell (BOOK) is good, if almost quaint, and I learned the word "ecdysis" with the clue for MOLT, so that's nice.
1A: Plentiful (AMPLE) - B-. It's slightly better than average.
Favorite clue/answer - 26A: Quest for the unknown? (ALGEBRA). Perfect for a puzzle solved at Huygens' place.