Yo Doug. I remember the Shamrock right there on M St on Georgetown. The "Country Gentlemen" were the club band for probably close to 30 years, and yes they played bluegrass. The Seldom Scene is also one of D.C.'s longest surviving band. I remember seeing them in the mid 60's when they went by "Corey, and the Seldom Scene". But there's more going on around D.C than bluegrass. Lots of good blues clubs....