The Chords Needed
To sing along and strum Happy Birthday on the guitar, you only need to know three open chords in the key of C Major:
- C Major (C) → The Root Chord
- G Major (G) → The Dominant Chord
- F Major (F) → The Subdominant Chord
*Note: If F Major is too difficult to play as a barre chord, you can play a simplified F Major 7 chord (Fmaj7) which is much friendlier for beginners.*