Japhet

Locomotive Breath - Jethro Tull

Sign of the Times - Prince (aka Squiggle)

Wishing I was Lucky - Wet Wet Wet

Fame - Bowie

Good Year for the Roses - Elvis Costello

Free Ride - Edgar Winter Group

I'd take a look at Francis Rocco Prestia Finger Funk. It's on Youtube (about an hour long). His whole approach is relentless 16th note grooves for Tower of Power. As stated earlier, economy of movement is key to being able to maintain the sound and accuracy of what you're playing. There's plenty of Tower of Power stuff to practice on too if/when you get fed up with Rhythm Stick.

That old Peavey stuff is amazing. I gigged for years with a MkVI head and 4x10 cab and the hammering that thing took was incredible. Never had a single issue with it, even when it frequently got soaked in beer.

Hallelujah - Leonard Cohen

I'm an Apeman - The Kinks

Fat Man in the Bathtub - Little Feat

The Middle - Jimmy Eat World

Summer Breeze - The Isley Brothers

Lowdown - Bozz Scaggs

Helter Skelter - The Beatles

Don't know if you got your question answered or not having had a quick read through. I'd say power amp have been used historically to amplify vocals, keyboards, drums, brass etc. Guitars and Bass amplifiers tend to have preamps to colour the sound with EQ and various other effects and functions. A power amp is a completely clean sound with no colouration. Bass players have started using power amp setups now that there are a myriad of preamp pedals and multi effects units on the market which create the tone they want. A standard bass amp has a preamp and power amp in one unit.

Too Rollin' Stoned - Robin Trower

24 Hours From Balsa - Gene Pitney

Float On - The Floaters

Good Morning Judge - 10cc

Because the Night - Patti Smith

The Sun Always Shines on TV - AHA

Castles Made of Sand - Hendrix

Can't Keep it In - Cat Stevens