What guitarist and singer/songwriter is famous for popularizing reggae outside of jamaica?

Multiple. I'm not super familiar with Reggae, but I can tell you a few things if it helps!
The Clash, a punk band, used a lot of early Reggae effects in their music. Joe Strummer, their singer, was a big fan. That's one reason why modern Reggae is classed with a more punk and gangster attitude today.

Hope this did a little help!

Es la plaza españa de colombia creo

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