added more to scales

scales.md

@@ -3,12 +3,7 @@ layout: post
 title: Scales
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-{{ page.title }}
-================
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-A scale is a succession of pitches ascending or descending in steps. Usually, the pitches are each notated with different letter names, though this isn't always possible or desirable. 
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-A step is typically considered to be the distance b
+A scale is a succession of pitches ascending or descending in steps. A half step (H) consists of two adjacent pitches on the keyboard. A whole step (W) consists of two half steps. Usually, the pitches in a scale are each notated with different letter names, though this isn't always possible or desirable. 
 
 ### The Chromatic Scale ###
 
@@ -18,9 +13,7 @@ A scale consisting entirely of half steps.
 
 ### The major scale ###
 
-A major scale consists of eight whole (W) and half (H) steps in the following succession: W-W-H-W-W-W-H.  
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+A major scale, a sound with which you are undoubtedly familiar, consists of eight whole (W) and half (H) steps in the following succession: W-W-H-W-W-W-H. The first pitch of the scale, called the *tonic*, is the pitch upon which the rest of the scale is based. When the scale ascends, the tonic heard an octave higher at the end. 
 
 ![The major scale][majorscale]