The summer is winding down, and for those of us who are staying in DC and starting to pay tuition bills again, free concerts become especially handy... 

The National Gallery of Art sponsors a concert series on Sundays at 5 - mostly classical and jazz:

http://www.nga.gov/programs/music.shtm

The National Cathedral has free organ concerts every Sunday at 5, as well:

http://www.cathedral.org/cathedral/music/concerts.shtml

A few upcoming free shows at Black Cat:

Sat Sept 1- WAG: 60s Garage and Soul $5 Backstage 9:30 

Sat Sept 8- THE SOULFUCK: 60s and 70s Soul and Funk w/ Soul Call Paul free Backstage 9:30 

Mon Sept 10- BLACK CAT 14th ANNIVERSARY PARTY featuring: ABS, ANCHORS, THE AQUARIUM, ARGOS, BRONTOSAURUS, IBID, FACEMAT, DENNIS KANE, PESSIMIST PARADE and more! free Backstage 9:00 

Fri Sept 14- BLACK CATatonia: 80s, hip hop, soul, electronica dance night w/ Turntablist DJ DK free Backstage 10:00 

This Wednesday at Rock and Roll Hotel:

YEMOLOGY: A breast cancer benefit

• EMPIRE BY DESIGN
• SITALI BAND
• OMEGA BAND
• MACHE TRES
• ARDAPLUS/ROSETTA STONED
• DJ TELEPHONE HOOKER

Doors | 730pm   Show | 8pm
FREE - DONATIONS ACCEPTED

Rock and Roll Hotel on Sunday, Sept 2

The DPD Project

"DC's infamous musical memoir mix-cd project takes over the upstairs bar
for a night of eclectic tunes from the DPD collection."

FREE | THE HOTEL BAR | 21+ | 930PM-130AM
 

Millenium Stage - the Kennedy Center's daily free concert series (particularly interesting - the Sept 4th Boheme performance/lecture and the Sept 5th screening of the Balanchine Don Quixote)

http://www.kennedy-center.org/programs/millennium/schedule.html 

That should get you started for September.