Three - or two, depending on how you count - Japanese movies that hinge on the same period in pop music, 1968-1970.
20th Century Boys (Parts I + II): it turns out they shot it as a trilogy, and the third part won't be out in Japan til August. I left off reading shortly after where the second movie stopped (around volume 20... I think?), so I actually have no idea what will happen. XD;; Will the third movie cover the sequel? Is that anywhere near done? There is so much to unpack in this story, and to the best of my memory I've never tried, because having watched Monster to the end I'm wary of deconstructing any Urasawa series ahead of time. Urasawa might wing it like CLAMP in the medium run but in the long run he's a moralist (also like CLAMP), meaning some conclusion or other is foregone, just that you the reader aren't in the loop. Five minutes before Tenma's final decision I had no idea how shit was gonna go down, but when it did it was clearly the only ending possible - for Tenma, anyway. Salvation lies in strange places.
( Though: there's only one part of 20th Century Boys I find specifically weird, and it's Urasawa's viewpoint on the music. Cut for RIDICULOUSLY LONG. )
...Actual movie-wise, it's kind of a qualified success. This is LotR epic shit obv and one can only be grateful that it wasn't rewritten more. As it is, the bildungsroman feel was almost entirely lost with the character backstories, reveals get telescoped, and some scenes plain lose effect as a result (*cough*Fukube*cough*). It also doesn't ratchet up the tension as well, which was where the Monster anime excelled. The casting was some form of genius, though! Barring Urasawa basing all his characters on real actors and them deciding to take up the respective roles, I'm not sure how they did it. And Ced and I both stayed absorbed for the 2h30min of the first part (he hasn't read the manga), so the storytelling does its work. I felt the second part lagged more, but I feel that about the manga anyway.
GS Wonderland: whereas this is a fluffy, nominally feel-good comedy that says nothing is authentic, at least not where the Japanese music industry is concerned. Not the performers, not the audiences, not domestic folk nor foreign rock nor manufactured pop. One would say, certainly not the management, except that the elbow grease put in by the management (and various label peons) is presented as possibly the most authentic cog in the machine. XD; And the friendships made through music, of course. Otherwise, Miku's persona as a female singer is no more true to her actual self than her persona as a male keyboardist in a Monkees-style group, the dudes who just wanna rock, maaan get all their moves from their "How To Play Like Hendrix" book, and the hysterical girls are just biding time until they find boyfriends who are not fake bishounen in a band. The wheel turns and all the players drop off at each round, but the Samsara ride itself never stops. It's only depressing if you feel about it the way Urasawa does, I suppose.
Note on the music for those who were at the showing: they got the songwriting duo who churned out these "group sounds" hits at the time to... write a bunch more in the same style. XD; Dudes must be like 70... I really like the main song, actually, with the organ vamp and the bass bit you can't really hear in the preview. There's stuff to unpack here, too, because this is the story of Japan's home-grown response to the Beatles (...appropriation, natch), and what's manufactured here reinvents itself as indie a quarter-century later, as Shibuya-kei. Or maybe that's too much of a leap; I'd like a go at proving it, though. XD