If you are playing along with another instrument, it is essential that your ukulele be in tune with that instrument. Tune the open strings of your ukulele to the corresponding notes of the accompanying instrument. E.g., to tune to a piano, tune the open 4th string to the G note on the piano, as shown on the keyboard diagram. Then tune your ukulele to itself from this note using the method outlined next, or tune each string of your ukulele to those notes of the piano shown on the keyboard diagram.