I think after 200 years the scores to the Mozart Piano Sonatas are in the public domain. I can look at the scores and download them from IMSLP
However, these are not suitable for consumption by a computer. I don't even know what the standard format is. Could it be MIDI? I am concerned that Midi will miss things like slurs, dynamics and other articulations (which are often put at very precise places). Nonetheless I found these:
It could be quite an effort (and also error-prone) to compile these myself. MIDI files also cannot capture the timbre of the musical instrument or a musicians artistic judgement.
Yet, are there any efforts to computerize classical music in a standard way?