This is the free version. Having a good sense of rhythm is one of the most important aspects for a drummer and for any musician. This app helps you develop the ability to retain rhythmic musical ideas and reproduce them immediately. This is a specialized area of musical ear training that is often under-worked. Whether you play drums, guitar, piano, keyboards, flute, saxophone, trumpet, violin, bass or any other musical instrument, RHYTHM is the main element you must develop. This app is very useful to players of any musical instrument who want to play with a good sense of rhythm. Since we don't need any melodic or harmonic elements to work with the aspects of rhythm, we use the snare, bass drum and cymbal of a Drum Kit to perform the exercises. As you progress through the exercises you will verify that the results in the practice of your instrument are really very positive. This is an important app for musicians and music students involved in playing any instrument, composing, arranging, and other areas of musical practice.