Jo Nelson plays DDMS 2017 | photo by Scott Troyan | scotttroyan.com | courtesy of the artist

We have our fair share of unconventional music venues in Philadelphia, but this one may be the most innovative — and it also may be one of the Philly music scene’s best kept secrets.

Each summer for the last couple of summers, longtime Philadelphia tour guide Sebastian Petsu, in collaboration with Bowerbird, has hosted the Double Decker Music Series, which is pretty much just what it sounds like — a concert held on a double decker bus. These are the kind of buses you typically see toting tourists around Old City, but while you will see plenty of historic sites in this series, this is certainly not your everyday tour of the city.

Held on the last Sunday of each month throughout the summer, this year’s series features an eclectic mix of local musicians, with two performers each night. Petsu will also share his knowledge of the city’s history and attractions throughout each two-hour event. The concerts come with a warning — according to the series’ website, “you can’t show up late or the venue will be gone!” Each concert begins and ends at the northeast corner of 5th and Market Streets.

Find this year’s full lineup below, plus a promotional video by Philly filmmaker Bob Sweeney. Tickets for all three shows are on sale now; find more information here.

June 24: Travis Johnson and Hallowed Bells

July 29: Nick Millevoi & Mike Kennedy and Apologist

August 26: Birdie Busch and Schuyler Thum