As a few Canadian groups have been mentioned, i will add the Crash Test Dummies who did some stuff that still sounds good 20 years later.
The live performance from a Bluegrass/Folk/Heritage band that amazed me forever was the Nitty Gritty Dirt Band live in Lawrence, Kansas at Hoch Auditorium
They had forgotten more musical history than most people know.
Crash Test Dummies - “Superman’s Song”
The Nitty Gritty Dirt Band - “Dance Little Jean”