Most recently, Billy wrote the music and lyrics for FIVE: The Musical, now playing at Theatre 555 Off-Broadway.

In the Summer of 2023, Billy achieved the rare feat of having three musicals running simultaneously Off-Broadway. These included the return engagement of A MUSICAL ABOUT STAR WARS at the AMT Theatre, the Seinfeld Musical Parody SINGFELD!: A Musical About Nothing at the Jerry Orbach Theatre, and LIGHTHOUSE: An Immersive Drinking Musical at Soho Playhouse.

Other New York and Off-Broadway Credits include additional songs for NEWSical (Theatre Row), Music for Keen Company’s Hear/Now Season of Audio Theatre, the original, long-running production of A MUSICAL ABOUT STAR WARS (Theatre Row/St. Luke’s Theatre) and the developmental industry presentation of FOWL PLAY, directed by JOHN TARTAGLIA and starring RuPaul’s Drag Race finalist Rosé.