Watch the C7 Skinny online guitar lesson by Brad Carlton from Chord Studies: Jazz Funk Vol. 1
When you listen to this example the first thing you're going to notice is that there is a melody occurring on the first string. Note how tension is created when we add the #9 in the second chord. This is built upon by moving the b7 to our lower voice in chord 03. The tension is released as we return to home base with a standard C7 chord.