In the interest of full disclosure, I should say right off the bat that Dave Drazin is a friend of mine. But I can honestly say he’s a terrific piano player, and plenty of others will tell you the same thing. Dave’s best known for playing piano at showings of silent movies, but he’s also an excellent player of old-time blues, jazz and ragtime, and all of those skills were on display during his superb set Saturday afternoon on one of the side stages at the Chicago Blues Festival.