Very nice. I love how you've coloured this, and the shading looks awesome. This reminds me of the scenes from Patrick O'Brien's "Master and Commander" where Captain Jack and Doctor Stephan are playing duets on a violin and a cello.
Very nice. I wanted to see someone draw the medic with a violin, based on his bonesaw taunts. He also must be pretty awesome to play a violin with rubber gloves on. That goes for Engie too, with his acoustic guitar. The colors are great, too.
I grew up listening to Bluegrass music. So my brain automatically cries out for the addition of a banjo, mandolin, and stand up bass. I would say more, but that's stealing my thoughtpower.