Japhet

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

Dedicated Follower of Fashion - The Kinks

Wild is the Wind - David Bowie

Run for Cover - Marcus Miller

Going Underground - The Jam

Sir Duke - Stevie Wonder

Going Down - Freddie King

Politician - Cream

Roxanne - The Police

Maybe it's just a matter of perception but I have all valve, hybrid and SS amps. The difference with the all valve head is that volume gain seems to be more linear as you wind it up and stays full and fat sounding with a bit of tube distortion, whereas the hybrid (class D) and SS stuff seems to get more 'shouty' and increasingly brittle sounding. 200 watts of valve power easily keeps up with 600 watts digital or SS. Could well be complete rubbish, but that's how it sounds to me.