We studied a skill acquisition process of samba dancing. We investigated the acquisition process by employing 30 subjects for six months. We installed a wireless accelerometer at the back of lumbar to measure acceleration of their movements. We analyzed collected data by evaluating autocorrelation and frequency analyses. We found that many subjects learned to keep a correct tempo of music during six months. We also found that several subjects showed accent of rhythm, which is necessary for samba. We expect that there are two stages of skill acquisition process of samba dancing: tempo and accent. We also measured acceleration of the arm movement of playing the shaker while subject is dancing. We found that several subjects showed accent of rhythm on playing the shaker as well as case of dancing. We expect that showing accent by dancing is necessary to show accent by playing the shaker.