Of course you have to mention Bob Marley. But other than Marley I listen to the following artists.
Gentleman, German born artist that pretty much lives in Jamaica now.
Martin Jondo, Found him through gentleman interesting voice.
Toots and the maytals, Good group just went to see them in concert this winter
UB40, An older couple I hang out with turned me on to these guys
Matisyahu, Hasidic Jew that puts out some decent music. I'm not super hot on his newest album, but I enjoy his first 2 albums.
I Wayne, really mellow music
And various others, these are the groups I listen to most.