The G major scale starts and ends on the note G and contains an F sharp (F#) note. It is demonstrated starting on the open G note. This is the lowest note on the violin.
So far you have learned the key signatures of A major and D major. Every scale has its own key signature. The G major scale contains one sharp, F#, therefore the key signature for the key of G major contains one sharp, F#. In Lesson Ten you learned the following piece in the key of A major. This time it is in the key of G major.