I was thinking of getting this 400 song book by Hal Leonard but wondered how it compared to the two Uke a Day books, which I already have. In the Amazon limited preview, it showed some of the same songs but a few were in other keys. Just curious if anyone has compared them more extensively. The Yellow Uke a Day book tends to be in keys that bottom out vocally for our Uke Club, the Blue book tends to be ok. Thanks.