The Tufts Sunday Concert Series presents the Tufts Symphony Orchestra, under the direction of John Page, in its annual fall concert, featuring an all-strings showcase of two contrasting works. Opening the program is Tchaikovsky’s Serenade for Strings, one of his most popular pieces. Full of lush melodies and virtuosic string writing, this Romantic classic has long been a staple of string orchestra repertoire. Julius Eastman’s epic work "Gay Guerrilla" ends the program. Written in 1980, this provocative piece is a…