Was RonBee's reply based on a corpora search? I'm not sure I'm entirely convinced by it otherwise.
But, in the Dire Straits 'version' of "Romeo & Juliet" there is a line:
"He's underneath the window ... singing ... my boyfriend's back"
in which the "underneath" (instead of 'beneath') seems a bit strange, save for the allowance we typically make for poetic licence.