here's an example of Reggae and Bluegrass combined... beautiful stuff...
DREW EMMITT BAND- Beat Of The World
THE WAILERS Ft SAM BUSH- Lively Up Yourself (Sam Bush is a legendary bluegrass musician who helped started combining bluegrass with different forms of music)
HOT BUTTERED RUM ft RAILROAD EARTH- Small Axe (orig by Bob Marley) -check out Sam Bush's electric mandolin... Bill Monroe might be jealous hehehe
bluegrass/country and reggae are not really that far from each other...
here's a country artists collaborating with a reggae artist...
ZIGGY MARLEY and WILLIE NELSON- This Time ( Willie Nelson is mah man!)