Listen to Optimistic Voices online. Optimistic Voices is an English language song and is sung by The M-G-M Studio Orchestra, The Debutantes and The Rhythmettes. Optimistic Voices, from the album The Wizard of Oz: Original Motion Picture Soundtrack (Deluxe Edition), was released in the year 2015. The duration of the song is 1:09. Download English songs online from JioSaavn.