Originally Posted by LeylaLanty

As far as I know (if someone knows for sure, please correct me), until Soheir Zaki danced to Om Kalthoum's music, no dancer had ever performed live to anything which had been sung by Om Kalthoum, not even "just the music". Also as far as I know, Soheir danced to a musical arrangement of am Om Kalthoum song (Inta Omri?), not while Om Kalthoum sang.

The performance by a dancer while Om Kalthoum sings in a movie would be an exception and was most likely acceptable because of the context of the scene in the movie and the part Om Kalthoum was playing.