The two CDs titled "Plugged into Khayyam Volume I [1] and Volume II [2]" are Persian Vocal tracks based on poetry of Khayyam. The CD can be purchased online.
Links:
[1] //www.net2infinity.com/plug1.html
[2] //www.net2infinity.com/plug2.html
[3] //www.net2infinity.com/music.html