Can't agree with that one puddicat they have a rich history of blues, jazz, blue grass, swing, country and western, zydeco, rock and roll, rock, metal, pop, disco, r n b, hip hop the list goes on....
The music tends to be more instrument based than european music, the europeans embraced electronic music in a bigger way.
What you have to remember with US it is so large you only ever hear a tiny proportion of what comes out of it. There are bands over their that are huge in their own states and make a more than good living but no-one else has heard of them.
Having said that the Brits in particular do seem to have reputation for pushing boundaries and starting new trends...but not all of them are good and even over here there have been no real new music trends for several years now.