We developed a distributed client/server network system which plays music almost synchronously using asynchronous REST communication sending music data. The tuning can be changed during the performance from the standard frequency 440 Hz to another, such as 506 or 377 Hz.  These changes imply that historically the tuning frequencies had been varied.  The violoncello part repeats Morse signals identifying some airports, which means that the tuning could not be the same in different regions. The piano part plays twelve notes simultaneously to indicate the temperament