When talk show bands play an impromptu song, how do instantly play in the same key?

Question

When talk show bands play an impromptu song, how do instantly play in the same key?

In: Other

Answer 1

Played in some bands myself. Usually there’s someone, typically keys player, with a mic that only goes to everyone’s in-ear monitors so they can talk. So they’ll be like “alright we’re gonna be in C major start on the 1.” And count it off.