BSO Music Director Andris Nelsons leads the Tanglewood Festival Chorus in Latvian composer Maija Einfelde's brief but moving Lux aeterna for mixed chorus, the first of two Latvian works performed this year to mark the centenary of the country's independence.

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On Sunday, September 30, at 3 p.m., the Boston Pops, in partnership with the City of Boston, will present a special free concert in Boston's Franklin Park.