This album is interesting and different. There are only 4 Beatles songs here which are not found on the other original albums.
All Together Now is the only one that captures the mood of the song Yellow Submarine. It is simple and easy to sing, but not very substantial.
Hey Bulldog is a great rock tune, with weak lyrics. John is clearly having a laugh at us, I think.
George Harrison's songs are interesting musically and lyrically. You get the feeling that he was trying to see what he could get away with, musically. I love the silly lines in "It's All Too Much,"
"and all the world is birthday cake
So take a piece ... but not too much!"
George Martin's suite of music which he wrote for the Yellow Submarine soundtrack is terrific. You hear him experimenting with some of the sounds which he had helped to create for The Beatles, such as the sitars and orchestral strings of Within You, Without You and the slurpy cellos of I Am the Walrus.
Pepperland is a lovely tune. I was privileged to hear Martin perform it live in Sydney [with some of the other Y S soundtrack music], around the time that his Beatles tribute album, In My Life, was released.
If you love the Beatles AND Classical music, I think you will appreciate this album.