In 1969 King Crimson produced a watershed album "In the Court Of The Crimson King" which along with bands like Yes, The Moody Blues and Caravan began the era of British Progressive Rock.
This version of King Crimson has only one founding member, Robert Fripp, and he is joined by Adrian Belew - guitar, Tony Levin - bass and stick and Bill Bruford - drums. Together they produced three albums that could almost be considered as a three record set with minimalist artwork that unifies the concept.
All of these musicians have roots in experimental music. Robert Fripp has done collaborations with Brian Eno and many others. The overall musical quality of these albums is first rate.
All three albums feature vocals by Adrian Belew and several instrumentals. The music has elements of rock, funk and electric jazz similar to bands like Weather Report and Herbie Hancock.
This music can be challenging. it is complex, the lyrics tend to have a stream of consciousness feeling and the instrumentals can get a bit out there but for fans of the early work there is much here to get into.