Here's an instrumental by Andy Summers and Robert Fripp. It's a demo for Andy Summers'
I Advance Masked (A&M, 1982) that doesn't appear on that album.
It's called "Hungarian Dance." A couple of passages from this track seem to me to be possibly quoted in the outro to Sonic Youth's "Rain on Tin."
http://www.sendspace.com/file/bttz0z 38 MB lossless .wav (3:47)
This was recorded at Arny's Place, Parkstone Studios, in Dorset, UK, sometime in 1981.