Hi Roper – tricky one as my dream dictionary has neither N Dubz nor pop music.
But to dream of being in a group of musicians suggests that you being urged to interact socially a bit more. To dream of musicians suggests an urge to control your creativity.
The bus driver element may suggest either worries about how you will pay your way through life, or how you give authority in a group situation. Interesting that you hired the bus from a group, so maybe this is the latter scenario.
Typically shopping centre/mall dreams are all about choices and in your case the Christmas element may be about choices at this time of year. There is a lot of symbolism in shops, and it may represent desires or goals that you feel are unattainable right now. Apparently shopping centres are quite common in dreams nowadays, but as there are so many aspects to the symbol it is quite hard to analyse.
To dream of classical music if you are a fan of modern music suggests the need to listen to advice from your elders. maybe the specific tune has other symbolic aspects too – I do not know the story of it.
Just to make you feel better, I had a dream about Simon Cowell a few days ago, so you are far better off the N Dubz I feel.
Hope this helps.