In a traditional capoeira dance, participants form a "roda," or circle, and two dancers enter the center of the circle to spar one on one. Generally, the dance or game is accompanied by call and response singing and the playing of traditional instruments: three "berimbaus" (a large stringed instrument in the form of a bow that is played by hitting the steel string with a wooden stick to create a resonating sound in the gourd attached to the bottom of the bow), two "pandeiros" (a tambourine with a skin cap on one side), and an agogo (a double pronged, two-tone bell). Upon entering the circle the two dancers begin swaying back and forth in rhythm with the music in a motion called "ginga." They then test each other with a series of sweeps, kicks, and tumbles, each dancer reacting to avoid their opponents' attacks. Pictured above, professor Marcos's students pair off and begin working on their "ginga," the fundamental base movement of capoeira.