When your strings begin to sound "dull".
It could be rust? Either way, you will want to change the strings. Sometimes the people at the guitar stores can change them for you if you dont know how.
take it to a guitar shop
The key of a capo should be placed on a specific fret of the guitar to change the pitch of the strings.
To change the key of a guitar, you can use a capo to raise the pitch of the strings or re-tune the strings to a different key using a tuner.
To change keys on a guitar, you can use a capo to raise the pitch of all the strings or re-tune the strings to match the new key.
Change out the strings with a lighter gauge. (Get thinner strings) ---Shawn
You don't! When the strings have become worn you throw away the guitar and buy a new one.
pitch
That depends on the guitar! On a Tenor guitar there are four strings, on a standard guitar there are six strings, and there are twelve strings on a twelve string guitar.
Not normally. You will get a variety of answers on this. In Rock it really doesn't matter. Replace a string when it breaks. No one will know the difference. With a classical guitar, the change in tone between new and old strings is more noticable. But I would not change the strings on a classical guitar until I broke one. Then I'd probably change them all. I have heard that some bands change the strings on the guitars before every gig. This is plain stupid.... just tying to be cool.
the tension on the strings are what gives each string the "tone"
To change electric guitar strings, first loosen and remove the old strings. Then, insert and secure the new strings one at a time, making sure to tune them properly. Cut off any excess string length and stretch the strings to help them settle in tune.