Live Music in Washington County MD. Antietam Brewery is hosting On Tap Duo. They will be performing live music from the 60's to current country, pop, and rock. This is part of a car show benefiting benefit the Cancer Treatment Centers of America, Come early to check the cars out, eat from Antietam Brewery, and enjoy the live entertainment. On Tap Duo is the first of a double feature so be sure to stay for the second music event.