When you let the accompanist know you are ready to begin.
Pupper! AU where Jay is a busker, and Tim is a business owner whose sister, Cass, has been in need of a new singer for her dances, since her other one passed away. He takes the bench next to Jason' waiting until the song's over to talk to him. "Hi- could I have a moment? You see, my sister's been looking for a singer and you have the right kind of sound she wants..." Fast forwards to Jason romantically serenading Tim, while Tim serenades right back.