Very sad right now. I have been a huge fan of Yes' music, and Chris Squire's playing since I discovered them in my teens. Seen Yes on many occasions.
Inspired by Paul McCartney and John Entwistle, Chris' creative and innovative approach to bass playing allowed Yes to go in many different directions, often in the same piece. He could play melodically, or rhythmically, or solo, and knew when to hold back, and when to let go, while always providing tremendous support and opportunity to the other musicians.
I'll never forget my first Yes concert in Madison Square Garden, took the train in from Princeton, NJ. My jaw was literally dropped at the experience, Heart Of The Sunrise, indeed!