Shanghai band Hello Money are the epitome of the mash up. They are international and have a wide range of musical influences and elements when they get on stage. Also, I make the reference cos they are famous for their complex mash-ups. And they get a lot of respect for being good entertainers too, when a lot of bands (yes, guilty) are more arty and self-indulgent.
They recently did some recording at Fanfare Studios and made some cool live videos of the sessions. Here's one called The Kitchen. It's some of their original material. Check out all the tracks here too.