The invention relates to the modularity of a reversible symmetrical single-pillar vertical support assembly (the Tower) which is the major structural component for a drum beating pedal apparatus (drum pedal). Said drum pedal can also be used to beat, without limitation, other musical instruments and musical accessories. Upon this Tower can be constructed various single-beater, multiple-beater and remote drum pedals and drum beating mechanisms according to the operator's requirements. This modular single-Tower drum pedal system also comprises several ancillary inventions which also can be applied in concert with or independently of the said Modular Single-Tower Drum Pedal System. These ancillary inventions relate specifically to drum pedal elements that directly affect and control the adjustability of footboard length; chain and/or strap length; single and multiple drum beaters in all axial positions including side-to-side, up-and-down, and fore-and-aft directions; beater stroke arc length and beater velocity; independent multiple beater adjustability; reduced friction spring-rocker floating-bearing support assembly; adjustability of the eccentricity of the cam hub; and a hexagon-shape drum beater shaft for secure 3-way position of drum beater head.