How to Tune a Guitar
There are many factors that can cause a guitar to go out of tune such as weather, time, and movement of tuning knobs. Guitars usually need to be tuned each time they are played. Guitar tuners can be purchased in almost any music store- popular music equipment stores include Guitar Center and Sam Ash.
1. Electronic Tuner
2. Piano or other instrument (be sure the other instrument is in tune)
3. Using only the guitar and your ears