To provide a phosphor having nearly spherical shapes, the phosphor has an elemental ratio represented by the formula below, and contains at least two kinds of Li, Na, K, Rb, Cs, P, Cl, F, Br, I, Zn, Ga, Ge, In, Sn, Ag, Au, Pb, Cd, Bi and Ti. The apparatus includes a mount assembly for fixing the apparatus to the percussion instrument and a paddle providing a playing surface. Furthermore, the rib can collect dusts and the foreign objects and discharge them out of the through holes. The suspended hammock assembly comprises a frame assembly having a base frame comprising a first longitudinal frame member and parallel thereto, a frame member, a hammock strung between hammock support elements.