ever decreasing circles
Both say "This video is not available" :(
oh that's odd, cos they're available in the US they are by Musica Elettronica Viva - The Sound Pool Pt 1 and Pt 2
Here's a UK-friendly one for Pt 2: https://youtu.be/TzWtuQbz9EII'm getting tasty flashbacks of tuning in to late night Radio 3 after Peel. Lights off, headphones on, thrilling to the weirdness.