ReiheExplore provides a simple way to navigate through 12-tone melodies. It follows the rules of the original dodecaphonic system composed by Arnold Schoenberg, in that all the notes of the western chromatic scale are used, without repetition, with the exception of the last note played in the melody which can be played an arbitrary number of tones in conjunction with the current note. It is an educational tool for students and composers to see that 12-tone music is fun and can be both expressive and intuitive to learn.