How to Tune a Guitar

If you want to be a guitar god, you need to have a properly tuned guitar. While there are electric tuners (or band assistants) to make the job effortless, a good musician must know how to tune his own instrument in a pinch by correctly tuning one string and then using it as a reference point for all the others. To tune a six-string guitar with the standard tuning method, follow these steps.

Steps

1. 
   1
   Know which note each string on the guitar plays.
   
   Note that there are two E strings on a standard six-string guitar. The thickest string is the bottom E (or low E) and the thinnest string is the top E (or high E). Low E is the top string.
2. 
   2
   Know which tuning keys correspond with which strings. Follow each string up to its tuning key and make note of how they correspond and which way you should turn them to make the strings tighter or looser. (Tightening will make the pitch higher, while loosening the string will make the pitch lower.) Be careful though, as to tightening the string too much may cause it to break.
3. 
   3
   Put the guitar on your lap in a comfortable playing position.
4. 
   4
   Tune the bottom-E string. This is the string you will use as a reference by which you can tune the rest of the guitar. (It’s good for this purpose because its thickness makes it less likely to detune.) Before you can do that, however, you must get it properly tuned.
   • Find a way to listen to an E note. This can be done using a (properly tuned) piano, a pitch pipe, a tuning fork, or a recorded E note found on the web as a .wav or .mp3 file. You can also use the A note of an A440 tuning fork for reference pitch.
     
   • Pluck the bottom-E string while listening to the E note from the other sound source.
     
   • Turn the tuning key for the bottom-E string until your guitar's bottom-E string sounds the same as the known E note. When the string is slightly out of tune, the E from the guitar will combine with the E from the sound source (i.e. piano), and cause the sound to "waver" in pitch. This is dissonance. As you tighten the guitar string, you should hear this wavering slow down; the two strings are in tune if the wavering has stopped. If you go too far, the wavering will increase again.
     
5. 
   5
   Tune the A string. Now that you have correctly tuned the bottom-E string, you can use it to tune the next string over.
   • Push down on the fifth fret of the bottom-E string that you just tuned and pluck the string. The resulting note is A (which is what you want the next string over to be) and can be used as your new reference point for pitch. This will be referred to as the fifth-fretted bottom-E string.
     
   • Pluck the A string (i.e. the next string over) and compare it to the sound of the fifth-fretted bottom-E string. Pluck the two strings in succession and then simultaneously.
     
   • Turn the tuning key for the A string until it sounds the same as the fifth-fretted bottom-E string.
     
6. 
   6
   Tune the D string.
   • Pluck the D string and compare it to the sound of the fifth-fretted A string. Pluck the two strings in succession and then simultaneously.
     
   • Tune the D string to the fifth-fretted A string.
     
7. 
   7
   Tune the G string.
   • Pluck the G string and compare it to the sound of the fifth-fretted D string. Pluck the two strings in succession and then simultaneously.
     
   • Tune the G string to the fifth-fretted D string.
8. 
   8
   Tune the B string.
   • Pluck the B string and compare it to the sound of the fourth-fretted G string. Pluck the two strings in succession and then simultaneously.
     
   • Tune the B string to the fourth-fretted G string. Note that this is the only time the fourth fret is used.
     
9. 
   9
   Tune the high-E string.
   • Pluck the top E string and compare it to the sound of the fifth-fretted B string. Pluck the two strings in succession and then simultaneously.
     
   • Tune the top E string to the fifth-fretted B string. Be very careful when tightening this string as it can break easily.
     
     sumberhttp://www.wikihow.com/Tune-a-Guitar