There have certainly been musical moments in “Star Trek” before: Uhura sang while Spock played his lyre in “The Original Series”; Data and Picard duet to Gilbert and Sullivan in “Insurrection”; James Darren played a holographic nightclub singer on “Deep Space Nine.” But it took “Strange New Worlds,” the critically revered Paramount+ series nearing the end of its second season, to stage an entire musical episode. In “Subspace Rhapsody,” Anson Mount’s Capt.