Check the listing for details. Hohner PentaHarp Harmonica A minor. Condition: New. Listed at 43.20 USD. The Hohner PentaHarp harmonica is built for all musicians, not just harmonica players. With an easy-to-understand intuitive design, you don’t have to use advanced techniques to get the notes that you know will work. You can play melodies and solos effortlessly. The pentatonic scale is one of the most useful scales in music for decades. Guitarists know this scale as “Playing in the Box.” Play any of these notes in the right key, and you wont play a wrong note. Hohner took this a step further by adding what is known as the “Blue Note,” which is an additional note that adds a little chromatic run for extra expression and is known as the Blues Scale. To play this scale on a standard harmonica, you would have to perfect advanced techniques that could take years to master.