Possible Clues:

• Unusually high voice
• High-pitched singing voice
• Artificially high voice of latest sort
• Is that high enough for an invoice?
• Novelty singing feature
• It's not true the tot is mixed to make one sound so high
• He is high, by the sound of it
• Voice of fine singer the group's drowned
• Voice pitch higher than the normal range
• Not a real tot, silly; only a high voice!