C Major’s relative key is A Minor ... they create a really interesting sound where one guitar plays the straight chords and the other frames the progression with other voicings or single ...

Guitar skills: 'Add’ chords come in the form of either ‘add9’ or ‘add11’. The name tells you to add either a 9th or 11th interval to a basic major or minor chord. So, Cadd9 is a C chord ...