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What is the Dimi?
There are two types of harmonicas that are familiar to most people: One is the 10-hole diatonic harmonica, which is also known as the blues harp. The blues harp is played by a diverse range of musicians such as Little Walter, Bob Dylan, Charlie McCoy, John Popper, and Howard Levy.
The other is the chromatic harmonica, which has the slide and a construction that makes it fully chromatic. It has been made famous by players such as Larry Adler, Toots Thielemans, and Stevie Wonder.
The harmonica is a rare type of instrument in that you can relatively easily change the pitch layout to suit your imagination, and either of the harmonicas mentioned above can be modified to have an an alternate tone layout. An analogy might be that of a typewriter with an alternate keyboard layout that is an improvement on the traditional qwerty layout.The "Dimi" is a nickname for both the Diminished Harmonica (an altered 10-hole diatonic harmonica) and the Diminished Chromatic Harmonica (an altered chromatic harmonica).
The Dimi Chromatic has a slide, which (most typically, but not always) raises each pitch a half step when pressed.