It's called Arabizi. Arabic words using English letters and numbers since its much easier to type using english and there are more letters in the arabic language so we use numbers to fill in the gaps.
Those two are the most famous and accomplished arabic singers of all time, both egyptian and their songs are still played all over the arab world to this day. I made two spotlights on them on /r/arabs:
Maqda7143 karma
It's called Arabizi. Arabic words using English letters and numbers since its much easier to type using english and there are more letters in the arabic language so we use numbers to fill in the gaps.
http://en.wikipedia.org/wiki/Arabic_chat_alphabet
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