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Harmonica Hub — which harmonica for which key?

The Harmonica Hub answers THE question every diatonic harmonica player asks: which harp to grab to play in a given key, and in which position? A two-way calculator, an interactive Richter layout and a guide to the positions — all free.

The key ↔ harp calculator

Enter the song's key: the hub tells you which harmonica(s) to use and in which position. The other way around, pick your harp (a C, an A, a G…) and it lists every key you can play with it. No more guesswork before you step on stage.

Understanding the positions (1st, 2nd, 3rd…)

1st position (straight harp) plays in the major key of the harp; 2nd position (cross harp) plays major/blues a fifth above — it's the go-to position for blues and pop; 3rd position opens up the Dorian mode. Each position is explained along with what it brings musically.

The interactive Richter layout

The standard diatonic harmonica uses Richter tuning. The hub shows the layout of all 10 holes (blow/draw) and highlights the tonic holes for the chosen position, so you can spot at a glance where the anchor notes fall.

Frequently asked questions

Which harmonica do I use to play in G?

To back a song in G major in 2nd position (cross harp), you use a C harmonica. In 1st position, you grab a G harmonica directly. The hub's calculator gives you the answer for any key.

What is 2nd position (cross harp)?

It means playing a diatonic harmonica in the key a fifth above its tuning, leaning on the draw notes. It's the blues position: a C harp then plays in G.

What is Richter tuning?

It's the standard tuning of the 10-hole diatonic harmonica: it favors blow/draw chords and imposes a particular note layout that the hub visualizes hole by hole.

Is this tool free?

Yes, the Harmonica Hub is part of the Maurisson Music Hub, free and ad-free.

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