Why Are Draw 2 And Blow 3 The Same?

Every truly cultured music student knows

Find your 10 hole C diatonic harmonica and blow hole 3. You’re playing G natural. Now draw hole 2. You’re also playing G natural. So why do we have duplicated notes on our instrument?

Well before we get all technical, for beginners it’s a great way to check that your 2 draw is true and not partially bent when you’re playing. When starting out, 2 draw can be hard to master. It can help to blow 3 and see if you are in pitch by comparing it with your 2 draw. If you’re experiencing problems, check out this helpful post ‘Why is 2 draw so difficult?. Now back to our two note conundrum. No it’s not a mistake, and yes, it does seem strange.

To solve the apparent mystery, let’s first consider blow 3. Our blow notes are arranged uniformly in terms of pitch. If we blow them in sequence from hole 1 to 4, we’ll hear the C major arpeggio. The same goes for holes 4 to 7, and 7 to 10 respectively. It’s the same result in three different octaves, each one higher in pitch than the previous, rather like a piano keyboard. (more…)