The Morris-Jumel Mansion in Washington Heights has historical blue blood—George Washington’s forces convened there before the Battle of Harlem Heights in 1776. Their resident ensemble, Brooklyn Baroque, will harken even further back in To the Nines, a program of composers with milestones in 2009. On the bill, and hopefully smiling down from the conductor’s riser in the sky: opera and concerti grossi composer George Frideric Handel, who died in 1759; Mannheim symphonist Franz Xaver Richter, who was born in 1709; and string quartet pioneer Joseph Hadyn, who died in 1809.

Sat., April 18, 4 p.m., 2009