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The present invention is a percussion instrument comprising a body enclosed on all sides by one or more walls. Internal to the body is a matrix comprising two or more compartments. One or more solid masses are located within at least one of the two or more compartments, and are used to produce sound

The present invention is a percussion instrument comprising a body enclosed on all sides by one or more walls. Internal to the body is a matrix comprising two or more compartments. One or more solid masses are located within at least one of the two or more compartments, and are used to produce sound.

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1. A percussion instrument comprising: a) an enclosed body comprising a cuboid and forming a cavity, the body enclosed on all sides by a rigid top wall panel that is planar from edge to edge, a rigid bottom wall panel that is planar from edge to edge, and a continuous side wall of panels having a fi

1. A percussion instrument comprising: a) an enclosed body comprising a cuboid and forming a cavity, the body enclosed on all sides by a rigid top wall panel that is planar from edge to edge, a rigid bottom wall panel that is planar from edge to edge, and a continuous side wall of panels having a first end and a second end, wherein each side wall panel is permanently joined together, wherein the top wall panel is permanently joined to the first end of the side wall panels, and the bottom wall panel is permanently joined to the second end of the side wall panels for sandwiching the side wall panels between the top and bottom wall panels, wherein the width of the body is between about 25 and 600 mm, wherein the length of the body is between about 25 and 3,000 mm, wherein the height of the body is between about 3 and 150 mm, and wherein the one or more walls are between about 1 and about 25 mm in thickness;b) a matrix comprising two or more compartments, wherein the matrix is integral to the enclosed body, and is wherein the compartments are between about 3 and 300 mm in length, between about 3 and 300 mm in width, and between 3 and 150 mm in height; andc) one or more solid masses, wherein the one or more solid masses are inserted and confined within at least one of the two or more compartments, and where the one or more solid masses are between about 1 and 100 mm in diameter. 2. A percussion instrument comprising: a) an enclosed body forming a cavity, the body enclosed on all sides by a rigid top wall panel that is planar from edge to edge, a rigid bottom wall panel that is planar from edge to edge, and a continuous side wall of panels having a first end and a second end, wherein each side wall panel is permanently joined together, wherein top wall panel is permanently joined to the first end of the side wall panels, and the bottom wall panel is permanently joined to the second end of the side wall panels for sandwiching the side wall panels between the top and bottom wall panels and comprising a width, a length, and a height;b) a matrix comprising two or more compartments, wherein the matrix is integral to the enclosed body, and wherein the two or more compartments are between 3 and 300 mm in length, between 3 and 300 mm in width, and between 3 and 150 mm in height; andc) one or more solid masses, wherein the one or more solid masses are inserted and confined within at least one of the two or more compartments. 3. The percussion instrument of claim 2, wherein the enclosed body comprises a cuboid shape. 4. The percussion instrument of claim 3, wherein the cuboid shape is rectangular. 5. The percussion instrument of claim 3, wherein the matrix comprises a checkerboard pattern. 6. The percussion instrument of claim 2, wherein the top wall panel, bottom wall panel, and continuous side wall panels are between about 1 and about 25 mm in thickness. 7. The percussion instrument of claim 2, wherein the enclosed body comprises a cylindrical shape. 8. The percussion instrument of claim 2, wherein the solid masses are from about 10 mm in diameter to about 100 mm in diameter. 9. The percussion instrument of claim 2, wherein the compartments comprise from 1 to 1,000 solid masses. 10. The percussion instrument of claim 2, wherein the top wall panel, bottom wall panel, and continuous side wall panels are comprised of plastic, metal, wood, rubber, nylon, vinyl, carbon fiber, or composite synthetic materials. 11. The percussion instrument of claim 2, wherein the matrix is comprised of plastic, metal, wood, rubber, nylon, vinyl, carbon fiber, or composite synthetic materials. 12. The percussion instrument of claim 2, wherein the solid masses are comprised of plastic, metal, wood, rubber, nylon, dried beans, rice, pebbles, vinyl, carbon fiber, or composite synthetic materials. 13. The percussion instrument of claim 2, wherein the solid masses comprise from one percent to seventy-five percent of the volume of at least one of the two or more compartments. 14. The percussion instrument of claim 2, wherein the number of compartments comprise from 2 to 40,000 compartments. 15. The percussion instrument of claim 2, wherein the enclosed body comprises a curvilinear shape.