Yes - 2 x BBC studio songs from 1969-70
Yes were undoubtedly one of the most talented group of musicians to emerge in the late 60's. Right from the start. Here to illustrate are a couple of their earliest recordings in the BBC studios: "Sweet dreams" and "Every little thing". The latter cover is just about unrecognisable, with lovely harmonies and musical complexities. I have a 3 song version of this video on Youtube including my favorite song "Something’s Coming" (from "West side story") I dropped it in case of copyright issues. It has some of the most beautiful harmonies you will find.