Led Zeppelin stayed roughly the same, but they had all kinds of influences mixed in from the start to sustain their sound and not get tired.

High on Fire to an extent. Matt Pike is an absolute riff machine and it seemed like every album up til sobriety was just a banger of an album after the other.

Primus I kind of think too, just because they have a very unique sound due to Les's Residentsy vocals and his bass style.

The Smiths? The Fall! Sonic Youth as well. Elliott Smith.

I think it kind of depends on how much you allow and what you see as their sound. You can always find examples and some difference in sound, but for many bands and artists it's more song to song or even producer dependent.

Hell I'd chuck in a band like Kyuss as well, most post-Kyuss projects John Garcia was involved with still sound like Kyuss because he was a massive part of the sound, listen to Slo Burn or Unida and tell me you don't hear Kyuss.

A lot of artists change more drastically, like you can tell if some song is by Nick Cave, but there's a huge difference from album to album, where as The Birthday Party though kind of had a specific sound they stuck to as well even if they explored it a little.

Ooh and Judas Priest in a big way, Motörhead too to an extent.

Good question!

E:typos