for me any performance is a performance
As performers mostly of the works of dead composers, we are in a constant battle between temporality and timelessness. Music in a life performance exists in vibrations for a fleeting moment and then gone. The goal is to make these moments speak a Truth.
For me the greatest advantage of being a musician is the freedom to do what I want and what interests me. So I would say the definition of success would be the ability to choose to do things that I love, to play pieces I love with people or orchestras I enjoy working and playing with.