A few times a year the selection of free concerts in Washington is good enough to lead this agenda, and this is one of those weeks. Here is the music you can hear this week for nothing.

>> Pianist Tamara Sanikidze and soprano Emily Albrink (soprano) will give a free concert this afternoon (April 19, 3 p.m.), with music by Grieg, Poulenc, Berg, and Rachmaninoff, at the Reynolds Center for American Art and Portraiture (8th and F St. NW). Free tickets to this concert will be distributed in the museum’s G St. lobby one hour before the performance.

Geringas Baryton Trio (L to R — cello, baryton, viola)

>> The baryton is a mostly extinct instrument, something like a cello with a set of resonating strings. If you want to hear what it sounds like played really well, the Geringas Baryton Trio is in town this weekend to perform not one, but two free concerts: at the Library of Congress on Friday (April 24, 8 p.m.) and the National Gallery of Art on Sunday (April 26, 6:30 p.m.). You cellists out there should also know that David Geringas will give a Cello Masterclass on Saturday (April 25, 12 noon) at the Library of Congress.

>> The Phillips Collection will host a Sunday concert (April 26, 4 p.m.), free with the cost of admission to the museum, featuring the violin-viola duo Marcolivia with cellist Amir Eldan.

NOT SO FREE:
>> Violinist David Grimal and pianist Georges Pludermacher will play all over the city this week, at Dumbarton Oaks on Monday (April 20, 8 p.m.), La Maison Française on Tuesday (April 21, 7:30 p.m.), and as part of the Embassy Series at the Residence of the French Ambassador on Wednesday (April 22, 7:30 p.m.).