. . . . . . . . . . . "Advertised title: Leon Theremin - Achievements of 1929-30\r\nTitle in program: Recital of Ether-Wave and Electrical Music\r\nAccording to information obtained from the Charles Ives Society (www.charlesives.org), Charles Ives was present in the audience for this performance." . . . . . . . . . . "1930-04-25T20:30:00"^^ . . . . "Recital of Ether-Wave and Electrical Music by Léon Théremin" . "chamber music performance" . . .