Time Out says
Here in NYC, it's very likely you'll pass by a brilliant musician or artist while rushing to your train, and at this concert you'll actually get to sit back and enjoy these subway performers. you know that busker on your commute who’s actually good? This annual summer concert series brings those (literally) underground musicians way above ground and to a wider audience—not to mention much lovelier environs—at rooftop gigs. Past shows have been held atop the Brooklyn Grange and the Bowery Hotel, and acts include classical violinists, confessional singer-songwriters, bucket-drum-fueled jazz outfits and foot-stomping bluegrass bands.