^Judging from the Massive Attack, Radiohead and Tricky albums he's bought I don't think we have to worry about him restricting himself to music that's only American.
PP, I'm only familiar with a few of the mixes you linked to (and too lazy at the moment to listen to the others), but based on your like of Massive Attack (and trip-hop in general, I'm assuming), I strongly recommend checking out Royksopp, a Norwegian-based electronic duo. Their music covers a wide range from upbeat electronic to very mellow chill and jazz.
I also suggest the artist Nujabes for your hip-hop, jazz, and chill needs. His albums Metaphorical Music and Modal Soul are particularly highly recommended, as are his musical contributions to the anime Samurai Champloo.