play by ear

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play by ear (third-person singular simple present plays by ear, present participle playing by ear, simple past and past participle played by ear)

1. (transitive and intransitive, of music) To play guided by one's musical ear, rather than from a written score.
2. (transitive and intransitive, idiomatic) To do by guessing, intuition, or trial and error; to react to events as they occur, often with risk of negative outcomes; improvise

   If they ask for something we didn't prepare, we will have to play it by ear.

• (do by guessing, intuition, etc, reacting to events as they occur): fly by the seat of one's pants, make it up as one goes along, wing it