Scales

The word scale comes from the Latin word 'scala' meaning ladder. A musical scale is a sequence of notes. 

     C D E F G A B C 

Scales are named according to the intervals between each consecutive note. The intervals between each note are not the same for every pair of notes in the scale. Most of the time, the interval between each is a tone or a semitone.  EasyTAB has a lesson on scales which will explain some of the theory. 
 
E Blues Scale

E-------------------------------------0--3---------
B-------------------------------0--3---------------
G----------------------0--2--3---------------------
D----------------0--2------------------------------
A-------0--1--2------------------------------------
E-0--3---------------------------------------------

Scales and EasyTAB

From the Scales pull down menu a list of types and variations of scales are available.  Once you have selected the scale you want to study reduce the tempo and play along.  As you improve you can increase the tempo.