Nut and fretboard This fretbox diagram represents the guitar’s fretboard exactly, as seen in the photo. This design is used for ease of visualising a fretboard scale or chord quickly. Chord example ...

Chord symbols can then be further expanded by adding extensions, such as a 7th. In the context of a symbol, such as C7, the default extended note would be one tone below the chord name.

Capo notation Here, the chord looks like a C in the tab, but the capo on the 2nd fret raises the pitch to make it a D. The 2nd fret capo’d notes are shown with a ‘0’ in the tab as if they were open ...