Have you ever been watching a show on television in closed caption when a song is being played? Sometimes, if you're lucky, they'll include a closed caption note: Song "Take Me to The River" by the Talking Heads played - or something to show the name of the song being played.
Okay, now, call me stupid but if closed captioning is meant for the deaf... isn't it a bit insulting to assume they know how the song goes? Sure, they could have lost their hearing last week but what if they were born deaf?
Could they sign "Play me a few bars cause the title ain't ringing any bells"?