Bedlam Bard Series by Mercedes Lackey, Rosemary Edghill

The evil elf-lord of the dark Unseleighe Sidhe plans to create a drug-enslaved army to break through to the human world and feed on the suffering there. Musician-mage Eric Banyon must somehow stop him.

Eric Banyon has more to worry about than passing his courses at Julliard. The evil elf lord Aerune, whose love was killed by mortal men, is determined to destroy the human race. Eric's only hope of stopping Aerune is to trap him inside a magical maze, from which there is no escaping.