ANSWER:

This is absolutely prohibited and your job is not permissible at all if you have to put music or women or any other haram content in your ads.

I was wondering if having a soft melodious (not string) music in the back of advertisement videos is Haram or not. For example, at the start or end of a TV show, and then ads on TVs. Are they haram, because if there is no tune then the ad is completely soundless. If it is haram is there a solution to this? I make marketing ads and therefore require to put soft music in the back