Bach, music and his life im Vergleich zu Mattheson Duet Sonatas Nutzung und Statistiken

Mattheson's duet sonata practice app. Contains 4 sonatas. SONATA Ⅰ(Op.1.Nr.1), SONATA Ⅱ(Op.1.Nr.2), SONATA Ⅲ(Op.1.Nr.11), SONATA Ⅳ(Op.1.Nr.12) You can play each part, change the speed, and change the pitch (440Hz and 414Hz), so you can practice according to your situation. It’s Sounds quite real because it is a sampled sound source.