A 10-hole diatonic harmonica is tuned to one key, so the key matters. Buy your first one in C: almost every course, book and video lesson uses a C harmonica, and its middle range is easy to bend. After that, buy keys for the songs you want to play.
Cross harp: why blues players use a different key
Played "straight" (1st position), a harmonica plays in its own key: a C harp for songs in C. Most blues, rock and country, though, is played in 2nd position, or cross harp: the harmonica plays in the key a fifth above its own, so you pick a harp a fourth above the song. A C harmonica plays blues in G.
| Song key | Harmonica for cross harp (2nd position) |
|---|---|
| E | A |
| A | D |
| D | G |
| G | C |
| C | F |
| F | Bb |
| Bb | Eb |
That's why guitar-friendly keys (E, A, D, G) make A, D, G and C the most-used blues harps.
Which keys are easiest to find?
Of the 727 diatonic harmonicas Thomann had in stock on October 19, 2026, C was the most common key by model name (61), then A and G (59 each), D (56), Bb (50) and F (49). Low tunings (Low F, Low D and others) add an octave-lower voice, and sets of several keys made up 21 models.
Good harmonicas in the keys you'll need first
Hohner Special 20 C, $37
A 20-reed harmonica in C with brass reed plates recessed into a plastic comb, made in Germany: the classic first harp. #3 of 159 diatonic harmonicas.
Hohner Marine Band Classic A, $37
The traditional blues harp, here in A: cross harp for songs in E, the most common blues guitar key. One of the highest-ranked harmonicas we track: #2 of 159 diatonic harmonicas.
Lee Oskar Major Diatonic G, $47
A G harmonica for cross harp in D, and for folk songs in G. #4 of 159 diatonic harmonicas.
Lee Oskar Major Diatonic Low F, $47
A low-tuned F harp, an octave below a standard F, for a deep, bluesy voice. #4 of 159 diatonic harmonicas.
Questions
What key harmonica is best for beginners?
C. Almost all lessons are written for it.
What key harmonica do I need for a song?
For blues and rock (cross harp), the key a fourth above the song's key: a song in E needs an A harmonica. For folk melodies played straight, the same key as the song.
How we measured. Every diatonic harmonica Thomann listed as in stock on October 19, 2026 (727), sorted by the key in its model name; models without a clear key aren't counted in the key totals. Prices are converted from euros at the European Central Bank rate. Products show today's price and rank, updated every night.
Share this story
Denis Kataev runs AudioFu. Every night the site records the prices of more than 38,000 instruments and studio tools at Thomann, and he writes about what those numbers show: what got cheaper, what just arrived, and which discounts are real.
All stories by Denis Kataev →
