I have been a long time member of ug.com, but this is my first lesson. I have noticed that in most of the "basics" lessons posted on this site, no one explains how to read the sheet music. Now, you are probably thinking that it is a major waste of time to be learning something like thet. Well, you're WRONG. Reading the music and knowing what note it stands for can be a valuable asset when it comes to writing songs and transposing from one instrument to another. Did you know that over 90% of popular musicians CAN NOT read sheet music. Imagine what they could do if they could read and write sheet music.
Let's start with the basic notes.
F---------------------------------------
D---------------------------------------
B---------------------------------------
G---------------------------------------
E---------------------------------------
That is what it will look like on the sheet.
The four spaces between the lines are labeled as so.
________________________________________
E
________________________________________
C
________________________________________
A
________________________________________
FYou're thinking, "That's all very well, but how do I play these notes on guitar?"
Standard tuning goes like this (lowest to highest) E A D G B E
For learning purposes, I ave extended the score to contain all of the basic notes.
G
F---------------------------------------
E
D---------------------------------------
C
B---------------------------------------
A
G---------------------------------------
F
E---------------------------------------
D
C---------------------------------------
B
A---------------------------------------
G
F---------------------------------------
EA pattern has emerged. The lines and spaces go upward in alphabetical order (E F G A B C D E F)(bottom, up)and so on. However, in the regular alphabet, there are 26 letters. In the musical alphabet, they only go from A through G and then they repeat themselves.
Basic notes of the first string (bottom string):
A pick without any fretting is the E in the space under the F line.
A pick with the first fret held is the F line at the top.
A pick with the third fret held, is the G above the F line.
Congrats, you have just learned the basic notes of the first string. I will proceed in the same format as above.
G
F---------------------------------------
E
D---------------------------------------
C
B---------------------------------------
A
G---------------------------------------
F
E---------------------------------------
D
C---------------------------------------
B
A---------------------------------------
G
F---------------------------------------
EBasic notes of the second string:
A pick without any fretting is the B line.
A pick with the first fret held is the C in the space above the B line.
A pick with the third fret held, is the D line.
G
F---------------------------------------
E
D---------------------------------------
C
B---------------------------------------
A
G---------------------------------------
F
E---------------------------------------
D
C---------------------------------------
B
A---------------------------------------
G
F---------------------------------------
EBasic notes of the third string:
A pick without any fretting is the G line.
A pick with the second fret held is the A in the space above the G line.
Careful here, the frets change, and there are only 2 notes.
G
F---------------------------------------
E
D---------------------------------------
C
B---------------------------------------
A
G---------------------------------------
F
E---------------------------------------
D
C---------------------------------------
B
A---------------------------------------
G
F---------------------------------------
EBasic notes of the fourth string:
A pick without any fretting is the D in the space under the E line.
A pick with the first fret held is the E line at the bottom.
A pick with the third fret held, is the F above the E line.
G
F---------------------------------------
E
D---------------------------------------
C
B---------------------------------------
A
G---------------------------------------
F
E---------------------------------------
D
C---------------------------------------
B
A---------------------------------------
G
F---------------------------------------
EBasic notes of the fifth string:
A pick without any fretting is the A line near the bottom.
A pick with the first fret held is the B in the space above the A line.
A pick with the third fret held, is the C line.
G
F---------------------------------------
E
D---------------------------------------
C
B---------------------------------------
A
G---------------------------------------
F
E---------------------------------------
D
C---------------------------------------
B
A---------------------------------------
G
F---------------------------------------
EBasic notes of the sixth string:
A pick without any fretting is the E in the space at the bottom.
A pick with the first fret held is the F line at the bottom.
A pick with the third fret held, is the G in the space above the bottom F line.
Congratulations. You can now read basic sheet music.
In my follow-up lesson, I will show you how they fit together to make basic chords and I will provide some simple songs for you to practice with your new-found skills.
Enjoy this new talent and PLEASE post your comments, positive :-), negative :-(, or otherwise:-|.
so it wouldn't help 
!E!-----!
!B!-----!
!G!---4---0-1-5-----!
!D!-2- --2-----3-2-!
!A!-----!
!E!-----!
in sheet music it would be:
-----
-----
O
---O-----
Ob
-----O-----
O
-O---O-----O-----
legend
%=sharp(actual sharp key isnt on my keyboard)
b=flat