Sitting in his little corner of the courtyard, Johann set himself down for some intense training.

As he flicked his parrying dagger quietly in the corner, the notes of a well tuned guitar began to spill forth from them. He could replicate a few instruments with his dagger. Drawing the blade through the air in steady motions from side to side could replicate a violin nicely. Raising and lowering the blade produced different pitches. Adding a flick to the motion recreated the sound of a string being plucked. He got the most precision when playing a single instrument, but even if he finished the motion the "sound" would continue to sustain itself at the same rhythm, at least for several seconds. This was important.

As the guitar continued to be plucked he turned his attention away from it, bringing down the dagger, flat side, on the air beside him. From that spot a drum played. You should probably start with a baseline first for a normal song, but percussion was easier than strings so it was best to leave it until after the others were up and running. All it took was a flat side strike, or several, to start it up, the power in the strike determining the type of percussion. He'd sat up one night after discovering this, hitting the air at varying strengths to get as many sound as possible. The only hard part was remembering which was which.

At that point it was more or less a game of spinning plates, renewing a motion every few seconds when an instrument began to falter, adding variations to the movement to change up the sound so it wasn't just one note played over and over again. Soon he had a nice little tune going as he tuned everything out. But this wasn't enough. At this point he was only good enough to spin two plates, and Johann had his sights set on more. 

He wanted to be an orchestra.