Aston Barrett is one of my favourite bassists but he isn't one of your "regular" reggae bassists. His lines are totally unique. If you want to get the feel and learn the style of Reggae I'd listen to others first, then progress to Barrett.
For starters, try stuff like :
Peter Tosh - Johnny B Goode, Feel No Way, Glass House, Reggae Mylitis etc
Toots and the Maytals - Pressure Drop, Monkey Man, Louie Louie, Funky Kingston etc