Timeliness and topicality can be tricky for a classical ensemble to pull off convincingly. But the Sirius Quartet—a group that emphasizes new music, including works composed by its members—hits the target on its latest recording, “New World,” a collection of songs reflecting on immigration, discrimination, and the quest for hope. Here, the quartet shares music from that project, in the final concerts of this year’s free Rite of Summer Music Festival.

Sept. 7, 2019 at 1p and 3p. Governors Island

— Steve Smith