Hayashibara Megumi is a VERY decent singer (she’s really good!), which made Spike’s line to her at the end of Ballad of Fallen Angels (“Tone deaf”) even funnier.
Crunchyroll.com has an audio clip of her singing so we can hear for ourself. Listen to Hayashibara san sing here.
Lyrics are posted on the video if you want to read along (if you read Japanese, that is).