The key of C major was discussed in Lesson Nine. Songs that use notes from the C major scale are said to be in the key of C. Similarly songs that use notes from the G major scale are said to be in the key of G major. Songs in the key of G will contain F sharp (F#) notes.
Instead of writing a sharp sign before every F note on the staff, it is easier to write just one sharp sign after each clef. This means that all the F notes on the staff are played as F#, even though there is no sharp sign written before them. This is called the key signature. Tab notation does not use a key signature.
The C major scale contains no sharps or flats, therefore the key signature for the key of C major contains no sharps or flats.
The G major scale contains one sharp, F#, therefore the key signature for the key of G major contains one sharp, F#.
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Waltzing Matilda is the most popular and well know Australian folk song. It is in * time in the key of G major. Remember that the key signature indicates that all F notes on the staff are played as F#. Try accompanying this song using bass notes on beats 1 and 3 of each bar. Play the F# note on the 4th string with your fourth finger and play the F# note on the 1st string with your second finger.
In any particular key, certain chords are more common than others, and after a while you will become familiar with the chords that belong to each key. Certain keys are easier for guitarists to play in and you should learn how to transpose (Appendix Four), so you can change a song that is in a difficult key (i.e., difficult chord shapes for a beginner) into an easy key.
The easiest keys for a guitarist to play in are C major, G major, A minor and E minor. The most common chords in the key of C major are – C, Dm, Em, F, G, G7, Am. The most common chords in the key of G major are – G, Am, Bm, C, D, D7, Em. You have learned all of these chords except for B minor (shown in the next diagram).
Bm
To play the Bm chord, use the first, second, third and fourth fingers of your left hand as shown in the diagram. Strum only four strings.
The following progression contains the Bm chord and there are two chords per bar each receiving two counts.
The following turnaround is in the key of G major. Each chord is played for two bars.