play by ear

Goolsbee said the Fed would need to "play by ear" whether any further rate increases are needed.

So I just taught myself more in church how to play by ear.

“I think it’s gonna be a little bit different. So we’ll just kind of play by ear when I get back home.”

Orgeron said Stingley and LSU initially chose to wait on surgery because his injury was a nagging one in which it seemed prudent to “play by ear” and see if it improved without surgery.

In his teaching Tony often encourages his students to play by ear, without sheet music.