Philadelphia Museum of Art

At the Art Museum's Friday night jazz series, the culture-to-cost ratio is unbeatable: The museum's $10 general admission gains you entrance to the jazz cabaret — and $2 off your first cocktail. Take in the skyline from the new martini bar on the portico, or relax in the cavernous Great Stair Hall, where more than 400 people groove to local jazz musicians' tunes. Coming up this month and in September, see pianist Farid Barron, the Dave Posmontier Duo, the Pearl Williams quartet, and Bobby Zankel and the Warriors of the Wonderful Sound.