I'm not going to name the best, but a few whom I think deserve mention.
I can't believe Guess Who was almost not mentioned until the END of the first page of this thread. :/
What about Natalie McMaster? She's great with her fiddle and violin
Kim Mitchell is from my town (my mother actually knew him in high school), but I like his music anyway so he gets my vote too.
Neil Young. Hands down one of the greatest lyricists of all time.
Laughing Sams Breakdown.
Barstool Prophets.
Das Hip, of course.
BNL. Matthew Good. Tea Party. Wide Mouth Mason. 54-40! (Hootie and the Blowfish be DAMNED). Crash Test Dummies!