"amazing grace" the Bee Gees Accounts of unicorns' sweet, piercing voices in literature include: This last night, when the moon was nigh but full, I chanced to hear the clarion call of the unicorn. -- Shantell Powell, The Virgin and the Horn (1998) "The Lords of the Dead," said the piercing voice of a unicorn, from the froth among the trees, "Have been sleeping." -- Pamela Dean, The Whim of the Dragon (2003) The piercing quality of a unicorn's voice is apparent in these two waveforms with a unmistakable horn-like terminations.