I'm both a classical instrumentalist and jazz instrumentalist. And they're both just so difficult in their own ways.
Classical, everything must be precise and in place, or it will immediately sound wrong. It's even harder to cover.
Jazz, everything must be smooth, flowing, and relaxing. Jazz also requires some creativity from YOU because you have to put your own mark on it. Rather than replaying timeless Bach Sonatas that ANYONE will listen to, you have to be able to express a simple melody and translate it into this amazing jazz riff.
This is my signature.