>Salvo, Michael Bush. I have never heard, nor ever 'heard of', those Christmas Songs...
>As-salamu alaykum -- peace be with you (Arabic)
alaykum al-salaam -- and also with you
>Shalom aleichem --peace be with you (Hebrew)
aleichem El shalom --and also with you
>In shaa Allah --If Allah wills it. (Arabic)
I can't say if they are in any songs... but probably.