No, bluegrass is not for everybody. But there are plenty of lazy sunshiney days out there when you just like the sound of a mandolin and a banjo battling back and forth.
Take Greensky on. These guys have been bluegrassin' for quite some time now and they're hitting bombs with every album they toss out there.
Shit's delightful. Try it on for size. Rock n' roll? Blues n' grass. Later.