I listen to music without words since with them I tend to try and listen too closely. However, music with indecipherable words or repetitive phrases are OK. Right now I'm listening to mostly:
Grouper, Burial, Ricardo Villalobos, Ahmad Jamal, Bill Evans, some classical sprinkled in, Ben Frost, Julianna Barwick, Black to Comm, Eno's Ambient stuff, Stars of the Lid, Magma, Boards of Canada, Gas, Leyland Kirby, Rachmininov, Zelienople, Belbury Poly, Mt. Vernon Arts Lab, Basic Channel, Eno-Moebius-Roedelius, Fursaxa, Jannick Top, Philip Glass, Wouter Veldhuis, and Montauk
Sometimes I think thats why Meta/Heavy rock works so well for me. It's easy to ignore the lyrics in the song and the vocals seem more like just another instrument.
Grouper, Burial, Ricardo Villalobos, Ahmad Jamal, Bill Evans, some classical sprinkled in, Ben Frost, Julianna Barwick, Black to Comm, Eno's Ambient stuff, Stars of the Lid, Magma, Boards of Canada, Gas, Leyland Kirby, Rachmininov, Zelienople, Belbury Poly, Mt. Vernon Arts Lab, Basic Channel, Eno-Moebius-Roedelius, Fursaxa, Jannick Top, Philip Glass, Wouter Veldhuis, and Montauk