This App contain the Telemann 6 Duets for 2 Treble Recorders .Since it is independent of each part, by playing the other part, you can practice together. This app, do not go out together for a marker to play. This app will be replaced by the score in accordance with the progress of the song. It is A = 440Hz (modern pitch)and A= 415(baroque pitch).It is to be able to play at a speed of 6 stages. Along with how to practice to play for each movement, it is also possible to practice by playing through one song sonata.