The Player Piano received the 2nd highest number of votes. The other songs receiving the most votes were "Mayday," "Scanning Faces," "NJB," and "After the Fact."
"Pi/4" can be found on the self-titled release, and the Japanese import "Satellite." Both records are out-of-print, but few copies can be found under rocks and in barns in different parts of the world. Good luck!
Otherwise available on iTunes/etc.