Driving down a quiet street on a summer day with the car windows down, you see a convertible approaching from the opposite direction, with the driver playing her car stereo loudly. having a well-trained musician’s ear, you notice that the song you hear is in a key one semitone (the interval between two adjacent keys on a piano) above the key in which the song is typically heard. you also know that to shift any note by one semitone, the frequencies must be related by a factor of 1.06. assume both drivers are traveling at the same speed, what is their speed?