Charlie Watts on drums.
That bloke from the Pet Shop Boys on keyboards (as well).

Charlie Watts?

John Entwhistle's face didn't change too much on stage. Seen some footage of him nearly smiling, until he realises the camera is on him and then promptly stops

Kraftwerk never looked like a barrel of laughs

Malcom Young tends to just stand there nodding a bit and wiggling his leg.

We also need an expressionless singer.

Hmm.

Mark Lanegan?

Surely he's expressing all the time? It must take enormous concentration to look so studiedly expressionless?

Wyman and Gallagher are good shouts, as is Chris Lowe and/or Ralf Hutter. Jet Black is too fat to express, so he might be a good choice on the tubs. Or Stephen Morris from New Order?

Playing an extended version of Jenny Ondioline by Stereolab...

Gillian Gilbert from New Order on two finger synth and generally looking very bored.

Jason Pierce from Spiritualized on lead, who not only barely moves any muscle not connected to the fretboard, but also stands stage right facing inward toward the band.

Brian Wilson on vox, unsmiling, eyes fixed permanently on something in the middle distance behind a huge Korg keyboard as on which he will barely play a note, between song banter on the autocue. Occasionally interpreting song lyrics with hand movements.

Instead of a drummer who mostly flail around and show off regardless, Can I have Bob Harris on a deck chair in the background, falling asleep with a pipe?

Bass? Take your pick.

The chap who supports Chas 'n' Dave ....... actually he may well be dead rather than bored.

Barely cracks a smile until the end of the gig

from Echo and The Bunnymen on drums.

Now that IS expressionless.

always look supremely cheesed off. Check out miseryguts at 3.11 -

Ian Paice looks only slightly happier here (2.17 onwards)

Maybe it was the pressure of being inexplicably shoved at the front of the stage - or having to awkwardly mime awesome drum fills. But still - I'd have been giggling my tits off if I was in Deep Purple!