The key of C major is often considered the most accessible and fundamental key for musicians, particularly guitarists. Including no sharps or flats, it serves as a perfect starting point for beginners. The C major scale, consisting of the notes C, D, E, F, G, A, and B, provides a rich palette for creating melodies and harmonies.

The key of G major is perhaps the most popular key for newer guitarists because the chords are easy to learn. The corresponding major scale consists of the notes G, A, B, C, D, E, and F#. Mastering this scale is essential for creating melodies, improvising, and understanding the chord progressions commonly found in G major.

The key of D major is a bright and uplifting tonality that is widely used in various musical genres, especially in worship music. The D major scale consists of the notes D, E, F#, G, A, B, and C#. Mastering this scale is essential for creating melodies, improvising, and understanding the chord progressions commonly found in D major.