Novice: I can read music and have basic technical skills. I am starting to explore chamber music repertoire. I can sight-read simple pieces slowly.
Intermediate: I play with a decent tone. I am comfortable at moderate tempi. I am peripherally aware of other parts. I can sight-read at a moderate tempo but slow down the hard sections.
Advanced: I play with a pleasant tone. I can get back in when lost. I can sight-read near concert tempo, except in difficult technical passages. I am aware of other parts and try to match them.
Expert: I play with a beautiful tone. I can play quickly and cleanly in difficult keys and with key/tempo changes. I am a strong leader. I can sight-read all passages cleanly at concert tempo (except pianists). I have keen awareness of other parts and know exactly how they fit.