Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: If someone is fiddling a fiddle at random, what song are they likely to play next?
unpredictable
It's impossible to predict which song a person playing a fiddle at random will play next.