Max Beaulieu’s review published on Letterboxd :
The other films feel like the guys are just dicking around and the music is its own separate thing, but despite not having any actual involvement from the band, Yellow Submarine seems to be the first of their films that is actually about the music, even when its not playing. It's got a Fantasia-esque quality to it, where the animation serves to visualize the music, but even when there is none, the visuals keep the style up as if the music might as well still be playing. Because it's less concerned with the four guys (hence why it's okay they're not even in it), and more with their music and how to cleverly integrate its style into an audio/visual experience. Its not really about the Beatles as people. Its about the music. Really spectacular, cannot recommend enough.