A percussion instrument configured as a shaker that is struck or shaken to produce a rattle or shaking sound. The shaker is a flexible, multi-chambered idiophone that can be struck or shaken at any angle or shaped into any number of configurations in order to generate a wide variety of sound characteristics. Furthermore, the flexibility of the shaker enables the instrument to be secured to a multi-purpose mounting bracket, which can then be attached to commonly available stands and arms that are used to support and arrange drums and cymbals.