A musical rhythm instrument comprising a hand-held hollow body having at least one opening and a plurality of particles in the interior of the hollow body, which, when the hollow body is moved rhythmically, impact upon its inner wall and create a sound, is provided with a hollow body incorporating a plurality of openings distributed over its surface and has a basic shape such that it can be largely encompassed by a hand that is holding it.

 
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> Systems and methods for generating music using data/music data file transmitted/received via a network

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