THE FLASH – MUSIC FROM THE SPECIAL EPISODE: DUET SOUNDTRACK NOW AVAILABLE SPECIAL MUSICAL CROSSOVER EPISODE FEATURES NEW RECORDINGS PERFORMED THE FLASH STAR GRANT GUSTIN AND SUPERGIRL STAR MELISSA BENOIST, PLUS CAST MEMBERS CARLOS VALDES, JESSE L. MARTIN, VICTOR GARBER, JEREMY JORDAN AND JOHN BARROWMAN FROM WARNER BROS. TV/THE CW’s DC SUPER HERO SERIES FEATURES …