I certainly don't think it brings the best out of a dancer not being able to dance to music you like, music you are familiar with etc. However a skilful belly dancer can dance to Western music- I've seen it done. Not a good idea for the less than competant and many less experienced dancers choose to dance to non-ME/Turkish music making the mistake that as it is familiar, they'll make a better job of a performane. WRONG! I tell students there's plenty of lighter/pop and ME/Turkish music and that is better that than dragging our "Dancing Queen" and this will complement their dance moves , Western music robably won't. It does not enhance your moves having to struggle to something like Lady Marmalade but I would imagine the dancer had a limited choice of tracks and this might have been the lesser of evils. She wasn't my style of dancer/not terribly skilful , certainly not a skilled as many British dancers (who wouldn't dream of entering a competition like this as they are not interested in a)pandering to the drooling Cowell or b) being humiliated by an ignorant auidence) but she was very presentable and glamorous and dressed a tasteful manner and entertaining for the GP (Genral Public) audience.
I can repeat that contestants do NOT get a free choice of music because of playing rights and fees and promoton etc. Neither Sophie Mei nor Urban Gypsies who reached the semis last year got a choice.
We may one day get a top class dancer who can present herself and our dance in the short space of time they are alloted but let's face they probably need a novelty factor or the panel won't be able to recognise "our kind of talent".
Frankly BGT has got more vital issues to addrees ie its' care of SN and under-age performers. Exploitation and degradation of performers are two distasteful aspects of this show. I watched a short snippet on what happened to a BDer called SnakeySue who performed with her creatures and got told "It was a shame her snakes weren't bigger" by Simon and Amanada tittered that she "slithered off stage". She was a long established entertainer in the UK (I have now idea of the quality of her dancing and I don't approve of dancing with snakes anyway) but I dare say she has actually harmed her career by entering the comp.

It was way at the end right before the second thread started. I posted it. Some of the others commented on her interview but the thread I posted just had the dance. There a few more vids of her on youtube.