On January 16, 1936, two obituaries in the Peekskill Evening Star appeared on the front page under the same name: Hamilton Fish. One was a well-known Westchester politician, a speaker of the New York State Assembly and a member of the House of Representatives; the other was a serial killer executed at Sing Sing for murdering a 10-year-old. These two men are the basis for Rachel Mason’s cinematic rock opera, “The Lives of Hamilton Fish,” featuring 21 original songs. Mason plays a newspaper editor, navigating the parallels between their seemingly opposite lives. The underlying psychological theme in Mason’s production is one of isolation, each character becoming increasingly withdrawn. Bold stripes of color decorate the three main characters’ faces, a representation of the Mark of Cain.