The theme song of Angel was written by an alternative rock group called Darling Violetta. It’s a lush and beautifully haunting ballad that blends classical elements (the gorgeous cello part for example) with a more contemporary rock style. While Buffy’s upbeat punk rock theme caters more to a teenage audience, Angel’s theme invokes a darker and more mature emotional response. This is not to say I believe Angel is a darker show than Buffy- they both have their moments. Darling Violetta also released a very cool extended remix of the song which can be heard here.
»All (I can’t choose only one): ”Words are, in my not-so-humble opinion, our most inexhaustible source of magic. Capable of both inflicting injury, and remedying it.” - Albus Dumbledore, The Deathly Hallows