Hooverphonic!

I’m not big on trip-hop but they’re my favorite. A friend also loves DJ Shadow.

DJ Shadow

Not really, no. They’re like Nine Inch Nails in that there are a lot of bands that you might like if you like them. But they’re also completely different and unique in ways that don’t apply to a lot of successful artists.

Someone mentioned Boards of Canada. If you like Massive Attack, you might also like them. They’re great! But they don’t sound like Massive Attack, imo. Best I can recommend is the first album by Sneaker Pimps. That also doesn’t sound at all like Massive Attack. MA is just in their own league.