Here is the song: “Countless Virgins (A Martyr’s Lullaby)” -- below is an explanation of how it came about.

After the events of 9/11, I tried to come to grips with why anyone would participate in a suicide mission that was designed to kill thousands of innocent people.  I had heard rumors about the Islamic “martyr’s reward” and looked it up on the web. 

Essentially, those who die or commit suicide in order to further jihad believe that they will go directly to paradise; they face no further judgment and none of the obligatory time in purgatory.  In addition, paradise (for men, anyway) is described in the authoritative collection “Sunan al-Tirmidhi” in the section called "The Book of Description of the Garden," chapter 23, titled "The least reward for the people of Heaven," Hadith number 2562.  It states: “The least [reward] for the people of Heaven is 80,000 servants and 72 wives, over which stands a dome of pearls, aquamarine and ruby, as [wide as the distance] between al-Jaabiyya and San’a." That these 72 wives are virgin is confirmed by Quran (55:74) and commentaries on that verse.

The quote above, and the comment regarding the confirmed virginity of the 72 wives I obtained from this website: http://bahai-library.org/theses/dying/dying4.islam.html

An interesting testament, “Anwar Shaikh: The Autobiography of an Apostate” is published at http://www.secularislam.org/skeptics/anwar.htm 

A quote from Anwar Shaikh:

“I regret to say that 1947 was the darkest period of my life. We were told that murdering the non-Muslims, seducing their wives, burning their properties, was an act of Jihad, that is Holy War. And Jihad is the most sacred duty of a Muslim because it guarantees him a safe passage to paradise where no fewer than 72 houris, that is the most beautiful virgins, and pearl-like boys wait for him. Such a reward is a great temptation!”

Thoughts of  the martyrs' reward have haunted me ever since.  Here is the song: “Countless Virgins (A Martyr’s Lullaby)”