Let me fill in a few gaps about Nour Mehanna.
Nour Mehana, from Syria, is a well known singer in the Arab world.
It is interesting to note that Nour Mehana’s previous occupation was a reciter of the Holy Qu’ran. Although I've been unable to verify Mehanna's religion, it would be highly unusual for a non-Muslim to choose a reciter of Qur'an as a profession.
One of Mehana’s recent songs, Um Shaheed which translates to the Martyr’s Mother, only serves to increase the level of concern regarding the actions on the plane.
It talks about the death of a Palestinian boy. The mother is advised not to mourn but to rejoice, since the son has died for the freedom of Palestine. It ends with the chants of the jihadis: "Allah Akbar”.
Freepmail me if you'd like a link to an audio clip of the song.
This is not intended as a slam against Nour Mehanna - however it is another interesting piece of the puzzle.
You have any idea how many musicians in the last 2000 years got their start in a church or synagogue?
Or how many songs of violence and mourning and matyrdom there are, just in the Scot/Irish folk tradition. Persepective is key.