Guitars are tuned E-A-D-G-B-E by standard, but I prefer tuning it down to C (C-F-Bb-Eb-G-C) since it gives a meatier sound and is easier on my fingers.

I know there are plenty of [other tunings][1], but is there any reason to use them other than to get a deeper sound?


  [1]: http://en.wikipedia.org/wiki/Guitar_tunings#Alternative_tunings