Here I found some of the songs of Khosro Ansari:
http://www.irmp3.ir/music/album_music/2887/%D8%A2%D9%87%D9%86%DA%AF-%D9%87%D8%A7%DB%8C-%D8%A2%D9%84%D8%A8%D9%88%D9%85-%D8%B4%D8%B4-%D8%AA%D8%B5%D9%86%DB%8C%D9%81-%D9%82%D8%AF%DB%8C%D9%85%DB%8C-%D8%A7%D8%B2-%D8%AE%D8%B3%D8%B1%D9%88-%D8%A7%D9%86%D8%B5%D8%A7%D8%B1%DB%8C
Hope these are useful information, if you have questions again just ask me
hi, Actually it is not a poem they are just parts of verse in persian poetry and Avaz (traditional vocal) which are repeated in many songs e.g. delam (my heart), jana, ay aman which are sung in most of traditional Avaz. One of the best masters of Avaz in Iran is Mohammadreza Shajarian. Listen to Shajarian's avaz here:
http://www.iransong.com/g.htm?id=19260
In this soundtrack the avaz is Iranian but the music is western electronic and it is hybrid mystic music. Some of the artists that'd practiced this type are the group "Niyaz" and "Axiom of Choice". Here you can listen to them:
Niyaz: http://www.iransong.com/person/2492.htm
Axiom of Choice: http://rockdl.biz/1390/02/%D9%81%D9%88%D9%84-%D8%A2%D9%84%D8%A8%D9%88%D9%85-%D8%A7%D8%B5%D9%84-%DA%AF%D8%B2%DB%8C%D9%86%D8%B4-axiom-of-choice-full-album/