This ring helps you transpose musical notes into different keys! It is a simple way to pick the number of steps or half steps you'd like to change for any musical sequence. Want to move a score up a major 2nd? Just turn the top band two position over. Works for any transposition you need. You can also use it for more complex variations such as descending 5ths root movements. One example is ii-V-I's which are the basis for most jazz tunes. Plus it just looks cool!