Darlington School choral director Erin Westmaas will perform with a Philadelphia-based, professional chamber choir called The Crossing on Jan. 3. The concert, titled “The Crossing in Winter: Lang and Esenvalds,” will be held at the Presbyterian Church of Chestnut Hill in Philadelphia.

“The choir began in Philadelphia and so far performs locally there, though many of the members are now scattered around the United States,” Westmaas said. “We are committed to the performance of new and modern choral music. I sang with this group the year before I started working at Darlington, though it didn’t work out in the schedule last year for me to do so.”

Westmaas holds a bachelor’s degree in music theory and composition from Calvin College in Michigan and a master’s degree in choral conducting from Yale School of Music. Prior to her work at Darlington, she was a lecturer in music theory at Yale, a voice instructor for the Yale Glee Club and music director for Yale University Church and Shoreline Community Chorale. She has directed, conducted and performed with several other vocal ensembles as well.

Westmaas and The Crossing will also give three summer concerts in June and July, performing pieces they have commissioned for a “Month of Moderns” project, funded by a grant from the Philadelphia Music Project.