(Harmonica). Harmonica Aerobics offers a 42-week regimen to help you play to your full potential. Whether you're a beginning or more experienced player, it's all here. The exercises include playing single notes and chords, bending notes, chord progressions, rhythmic precision, improvisation, strengthening your mouth and tongue, increasing your lung capacity, and much more, including audio tracks for helpful practicing. The audio is accessed online using the unique code inside each book and can be streamed or downloaded. The audio files include PLAYBACK+, a multi-functional audio player that allows you to slow down audio without changing pitch, set loop points, change keys, and pan left or right.