This week's guitar secret has to do with tuning your guitar.
Many professional guitarists tune their guitars to E flat.
The tuning would be E flat A flat D flat G flat B flat and E flat. The main reason why you would tune flat would be to accommodate the vocalist. The vocalist may not have the range for the E tuning. If you tuned your guitar down 1 half step you could still play the same guitar chords, but it would now be lower by one half step. So, the next time you learn a song, see if it has been lowered.