that is PROPER attire for full formal 19th century, although I question the use of the sash- it was usually reserved for nobility and royalty- you can see it to this day , although the members of Windsor house tend to wear dress uniforms rather than formal dress- so it's odd only b/c of your station and country- the other point I wish to make is that they are really good, and you don't usually see boogie woogie written for 4 hands- I was expecting the old mirror image selection where one pianist simply mimics the other, but that's a proper 4 handed selection- my mom has ancient music (hymns and whatnot) written for four hand and inside, a PROPER gentleman would have removed his hat- along with his overcoat and walking stick, and given it to the doorman
Dr John (the heavy set guy with the beard) has been around a long time. He was born Malcolm John Rebbenack Jr in New Orleans, grew up on the streets and was originally a guitarist...until he had the tip of finger on his left hand shot off defending his piano player during an altercation in a dive they were playing.
He became a very popular session musician in the 60's, and eventually invented the persona of "Dr John the Night Tripper", combining blues and rock and zydeco and threw a little voodoo in during his during his stage shows.
He had one big hit back in the early 70's with "Right Place, Wrong Time".