Tales from Topographic Oceans, as well as plenty of Steve Howe's solo output from that time is chock full of eastern scales and esoteric widdling - his contribution to Yes is that they would have sounded far less exciting and inventive if he were a more regular guitar noodler. His playing on their version of America is brilliant.
If you can find it (coz it's not on Spotify) - get Keys to Ascension I and II (both are double discs) - it's mostly a live concert (2 or 3 nights) from a hall in San Luis Obispo, plus about an album's worth of new material. The live material is fabulous: Siberian Khatru, Close to the Edge and Awaken are pretty transcendent - their best versions in my opinion.