Metro rides are rarely quiet, whether the sounds are coming from phones calls, headphones, or the joyful Christmas caroler who serenaded Orange Line riders this past winter, and harried commuters aren’t likely to stop and listen to the musicians performing inside or outside stations—remember when Gene Weingarten had Joshua Bell camp out at L’Enfant Plaza and no one noticed? Still, through its MetroPerforms! program, WMATA invites a collection of local musicians, ranging from saxophonists to R&B vocalists, to perform at stations in July and August. Performances within the Metrorail system conclude this week, but some of the acts will celebrate the program at the Kennedy Center’s Millennium Stage. Among those appearing are the Supreme Chords, an a cappella ensemble that induce flashbacks to your college campus. The concert’s still free, but at the Millennium Stage, you’ll hopefully avoid lost pigeons and the fishy smell of Metro’s brake pads. The performance begins at 6 p.m. at the Kennedy Center’s Millennium Stage, 2700 F St. NW. Free. (202) 467-4600.