Slightly confused novice here.

In this key signature (Ebm) E and B are already flat.

On top of that, in these bars there is an Ebb, and a Bb.

I'm told that the Ebb would become D natural regardless of the key signature, but then what about the Bb? Surely it can't be A natural? Am I reading this incorrectly?

Ebb is enharmonic to D, yes. I'm not sure if I understand the question correctly. Bb would be enharmonic to A#, not A (a semitone higher than A).
Ebb would become D and Bb would become A# if i'm not mistaken.
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i think it would have to be an a, which would possibly be part of an inversion on the c in the bass.

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Bb = A* (Macs don't have the "sharp key", so stars have to do :L) so Bbb would be A natural by that logic.

The C in the bass sets the key of C major (no sharps or flats), and A complement that well.
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Perhaps the Bb is a cautionary accidental.

I didn't even know what that was, but I looked it up and I think you are right. There is a Bbb in the vocal line in the same measure (I should have posted that!), so I guess this is just a reminder that it's still Bb in the harmony. Thank you.
Last edited by Telecustard at Sep 8, 2009,
It might be a misprint. I don't really see the point in throwing in a random cautionary accidental in a 6 flat key signature. Unless it just modulated from a key without Bb, but then there would be many more.
Lets pretend your the the key of Eb and you have a measure with a flat marked in front of an E. You just play it as Eb, the flat they put in front of the note is just a reminder.

If you have the same situation with a double flat, you play Ebb. Accidentals always override a key signature