A percussion musical instrument comprising a set of clave blocks each comprising a body having an open cavity therewithin. The bodies of the clave blocks have substantially equal exterior dimensions and assorted volumes of the open cavities therewithin provided to generate musical tones of assorted pitches, such as low pitch, medium pitch and high pitch. A volume of the open cavity of the low pitch clave block of the set is larger than a volume of the open cavity of the medium pitch clave block, while the volume of the open cavity of the medium pitch clave block is larger than a volume of the open cavity of the high pitch clave block. Each of the clave blocks of the set further includes a mounting rings.