Tuning explanations
The tuning of a guitar basically explains the pitch that all six strings are
tuned to. This means that, using the "tuning pegs" at the end. John Mayer
mostly uses the E-standard tuning. He does sometimes use drop-D or a different
tuning. All tunings used are explained here:
E-standard
EADGBE
Drop-D
DADGBE
Drop-C
CADGBE
In your atmosphere
EBEF#BE