Define You'll Hear It Meaning

You'll Hear It
Phrase said by experienced musicians to a newbie just joining the band for the first time. Also common in jazz improvisation situations. This phrase may be said at rehearsal time OR when playing live.

Puzzled new musician:
"So how was that line over the 3/4 bar in the B section?"

Band member:
"Don't worry, just keep up with us, you'll hear it".
By Jordan