I didn’t believe it either- until I heard the singing in “Her Highness and the Bellboy”, whether it’s June or Patt, it’s the same singing voice in both. I’d like to believe it’s as you say, Patt added into the song where needed. I’d be really curious to see the MGM music cue sheets.I'm not buying it. I went back and listened to both songs in question tonight and I just refuse to believe it. The singing voice matches June's speaking voice too much. I'm not saying Patt Hyatt didn't perhaps help with the sweeter notes that June maybe couldn't achieve (it's conceivable) but at least some of both of those songs is her natural voice. The opening verse of "Best Thing in Life" is basically talk-singing anyway and there's no way it's anyone else. The singing voice in both of those songs has no more than a casual similarity to Patt's voice in the clip above.