If you want LOTS of diversity, try out Tangerine Dream.  Four decades of bunches of styles.

Joe Jackson is a tough one to pin down.  He went from punk/new wave (Look Sharp. I'm The Man), to big band jazz (Jumpin' Jive), to pop (Night & Day), a symphony and a tribute to Duke Ellington round out the catalogue.  

There is company out here that runs something called Rock Camp for Dads, I’ve talked about it before ... great business model.  For a very modest price (yes it’s pay to play) they get together a band for a month (with a theme), give you 12 hours of studio rehearsal time and give you a one set gig at one of the local premiere clubs at the end of the month.  I’ve done a few of them and they are a lot of fun.  I did a “Cult” themed camp a few months ago and I will say without exception The Cult were the LEAST diverse band ever.  I wasn’t at all familiar with their music prior to the camp and spent a little more than one month listening to about 9 Cult tunes over and over again every day.  I will say that after a month, with the exception of Fire Woman, I couldn’t name the song I was listening to and when we were actually playing them I was having trouble keeping track of the arrangements for the different songs.  Their songs just came across as cookie cutter with bits and pieces of Zeppelin and AC/DC mixed in (I ended up using cheat sheets … something that as a general rule I do not do).

I am almost too embarrassed to post a video from the gig but I’ve embarrassed myself on these forums so … what the hell,  I do have to warn you the skill level of the players is all over the place but my drumming is reasonably solid but you really don’t see me:

http://www.youtube.com/watch?v=AqiUYiuVTYM

The Ramones?

Jethro Tull have tried a few styles in their 40 years..started off as a blues band, ditched that for riffy little songs on 'Stand Up', full blown prog on 'Thick as a Brick' and 'Passion Play', then did a detour into English Folk on 'Songs from the Wood' and 'Heavy Horses'.

They did one almost entirely electronic/synth album 'Under Wraps', then headed into Dire Straits territory with 'Crest of a Knave' and 'Rock Island', before going all 'world music' on 'Roots to Branches' and 'Dot Com'.

Neil Young has covered a lot of ground.
Compair these albums:

Comes a Time
Harvest
Zuma
Weld
Mirror ball
Re-act-or
Trans
This Notes For You
Greendale

Alice Cooper is a favorite of mine and covered a whole lot of ground.
 
Pretties for You and Easy Action, totally weird. 
Then the remarkable series of rock album he put out w/ the original band, almost all classics.

Then the strange stuff he did post Welcome to Nightmare, like Goes To Hell, Lace and Whiskey, From the Inside and such (all of which I dig for some reason or another, anyway). 

Flush The Fashion - which I think is a pretty good new wave-ish album. 
Dada, cool album too.

Then the comeback stuff, which was more metal-ish.  Still good stuff.

Then, Trash which was quite a little gem in its time, though very commercial. Some pretty good songwriting and good performances all over that album.

Rain


The Ramones?

I still think The Cult were less diverse and more derivative ... The Ramones were part of a scene.

http://www.youtube.com/watch?v=sL9iuAd93B8

Screwfix have a very diverse catalogue.

 Queen