I finally watched this with my wife with somewhat higher expectations than perhaps we should have had. This was a real disappointment of a movie, and the soundtrack totally failed to redeem the movie as well.
I don't know about anyone else, but I thought the dialog and singing sounded like ass. I mean, apart from all the glaringly obvious use of auto-tune and digital processing to alter the singers' voices (similar to "Into The Woods"), I thought the dialog and song tracks sounded hyper-compressed and were mixed too hot relative to the rest of the sound. The few times I heard the score playing, I thought it sounded kind of nice, but the excessive dialog level drowned everything out and had me turning down the playing level on this movie relative to most titles.
Unfortunately, I'm starting to notice a pattern here in which many (but not all) recent Disney releases have compressed soundtracks and especially hyper-compressed dialog. I have no idea if this treatment does in fact improve dialog intelligibility on TV speakers or whatever, but I don't find it helpful at all on my system. Upper mids in inflections tend to be overemphasized making it sound like everyone is yelling all the time. Meanwhile every bit of nuance is either unrealistically accentuated or lost completely. It's bad enough to make me avoid buying anything Disney without renting first. I am a huge fan of Studio Ghibli films for which Disney has exclusive U.S. distribution rights, and in my opinion, this kind of treatment to the audio is very degrading to these films and to the talents of the voice actors.