King Crimson was very progressive and, yes, there is a connection. The connection is Greg Lake; bass and lead vocals. I know he (Lake) was with King Crimson on In The Court Of The Crimson King, but I don't know how long he stayed with them as, over the years, the band went through many personnel changes. However, that one album is a classic and if memory serves me correctly, I still have the LP in a box somewhere, but no turntable. I picked up the CD not too long ago and was pretty disapointed with the remastering. Uh-oh, almost getting back to the analog/digital battle.