Bass Drums

In music, the bass drum is used to mark or keep time.
 In marches it is used to project tempo (marching bands historically march to the beat of the bass). A basic beat for rock and roll has the bass drum played on the first and third beats of a bars of common time, with the snare drum on the second and fourth beats, called "back beats". In jazz, the bass drum can vary from almost entirely being a timekeeping medium to being a melodic voice in conjunction with the other parts of the set. In classical music, the bass drum often punctuates a musical impact, although it has other valid uses, depending on the size, and how and where the drum is struck. Implements used to strike the drum may include bass drum beaters of various sizes, shapes, and densities, as well as keyboard percussion mallets, timpani mallets, and drumsticks.

There are 3 major types of bass drums. The type usually seen or heard in orchestral, ensemble or concert band music is the orchestral, or concert bass drum (in Italian: gran cassa, gran tamburo). It is the largest drum of the orchestra. The 'kick' drum, struck with a beater attached to a pedal, is usually seen on drum kits. The third type, the pitched bass drum, is generally used in marching bands and drum corps. This particular type of drum is tuned to a specific pitch and is usually played in a set of three to five drums.