This wristband from Sony let's you interact with music
Sony recently revealed the experimental wearable, the Motion Sonic Project (MSP) at the South by Southwest (SXSW) festival.
The MSP is equipped with a number of sensors and microphones that are used to capture data such as speed, rotation and the angle of your leg and arms. As you move around while say dancing to the music, the MSP will translate these data into one of the five preset functions that manipulates the current song that. However, what the MSP lacks are actual speakers; you will need another source to play the music, like a Bluetooth speaker.
This will be rather interesting to say a group of dancers who are constantly moving a around, as they could make their bodies into elaborate instruments.
As of the time of writing, there is no release date for the MSP yet, being a prototype it will require significantly more testing and possible redesigns.
Source: The Verge