Sara Bareilles' songwriting skills are all over the new Broadway musical Waitress - even down to the cellphone warning.

The singer-songwriter of 'Brave' and 'Love Song' has recorded the 40-second please-turn-off-all-electronic-devices warning that most Broadway theaters now provide.

Over staccato piano notes and shrill ringing, Bareilles sings: "Do it now, while I sing, because no one's going to like you if your phone rings. Hurry up so that we can start the show. Thank you so much. Now turn off your cellphone."

You can hear the catchy and not at all annoying (ahem) little number below.