I'm not familiar with a band that's evolved and changed as much as Voivod.

Fugazi

The Archers of Loaf changed an awful lot.

Not necessarily for the better but it was an admirable difference with each album.

Uzeda.

Propagandhi.

WEEN

154 wrote:Fugazi

they were good, got better, then got boring.

Coltrane's Classic Quartet

Don Cab (excluding that last piece of chop shop garbargio)

The Clash

The Ex

Fugazi

Sunn O)))

The Who

Lungfish

There aren't many, really. As mentioned, the Flaming Lips really stick out for me, having seen them in 1989 and then not again until 2000. Almost two different bands. Others:

The Kinks

The Replacements (last record aside)

Ministry

Scott Walker

Marianne Faithfull