Mezzo-soprano Abigail Fischer and all-star collection of musicians will perform the New York premiere of Harold’s complete song cycle Variations on a Summer Day, for voice and nine instruments, setting the twenty stanzas of the Wallace Stevens poem of the same name. The nonpareil Boston Chamber Music Society, with Max Levinson, piano, will perform the New York premiere of his 2016 Piano Quartet, and members of the Cygnus Ensemble will play the World Premiere of his Battle Piece for two guitars.