How to use tone in two pins?
Only one tone can be generated at a time. If a tone is already playing on a different pin, the call to tone() will have no effect. If the tone is playing on the same pin, the call will set its frequency. Source: arduino.cc - tone().

noTone() Stops the generation of a square wave triggered by tone(). Has no effect if no tone is being generated. Source: arduino.cc - noTone()