I often wonder whether the advert-makers realise that if they make the music too interesting, people like me are too busy listening to the music to hear what's being said over it.

I agree, and I often find the same in Tv dramas or movies, when they are playing music in the background. Sometimes I miss all the dialogue because I'm straining to hear an old song I know being played in the distance.

And some advertisers make the adverts so off the wall that it's difficult to even tell what the product is they are trying to sell - is it a car? Insurance? Some sort of instant microwaveable food?