That analogy is not astray at all, it is perfect.
In fact, the closest analog to sample performances is oil painting. It is an absolutely perfect metaphor. Each note, performed separately, is like a single dab of paint on a pallete.
This is not merely performance art. It is a creative collage art as well. That is another analog which fits samples - collage. The artist assembles elements which he himself did not create, yet which taken together create a new work.
Anyway, I agree with the ideas on this thread about studying a great masterpiece with an ambitious sample performance of it and congratulate the author of the thread for his work. In fact, it is probably the best way ever invented to study a score - far more intensive than merely copying a score, as Beethoven himself was known to do. In the case of sample performance, one has to copy the score but also do a complete conducting job on it. It fact, a meta-conducting job, if I may be so bold. To do a sufficiently detailed and expressive sample performance requires far more musical skill than a conductor has to have.
Just ask any orchestral player about that... [[;)]]