@Bitmap, @alastairp, @reosarevok, or @CallerNo6? I’m not sure who has “the ball” right now.
Even if the 99+% of instances of “dnb” is for “drum and bass”, that doesn’t mean the one “Deutsche Nationalbibliothek” is as well. Also, “drum and bass” could be used for instrumentals that literally consists of someone playing drums and someone playing a bass (I imagine something jazzy, and/or maybe a hiphop/rap beat). Folksonomy tags are a hack for genres at best, claiming that any two are identical is as well. But I feel like I’m sidetracking from the actual discussion. C’est la vie.
Haha. Drupal 4 lyfe! (I’m also an old Drupal developer. 
)