If you're having trouble coming up with as topic for your Dec. 15th paper, consider this.
Levinson wants the following (HK = The Hammerklavier Sonata):
HK can be performed on the piano.
HK can performed on the fortepiano.
HK can be interpreted in various aesthetically interesting ways where each of those various performances are performances of HK.
HK cannot be performed on a perfect timbral synthesizer.
In answering this, try to be conscious of the difference between instances of a work and performances of a work for Levinson.