All of the riffs you have so far played have been based on scales (i.e., major, minor and Blues scales). Many riffs, however, use notes which are in between the given scale notes. These notes are referred to as passing notes. The use of passing notes will create chromatic runs, i.e., moving one fret at a time. The following examples illustrate chromatic movement.
Play this riff as a 12 Bar Blues in A.
The following minor riff uses the Blues scale notes (see Lesson 13 ) with a G# passing note.
D# and Eb are enharmonic notes, as they have the same pitch (i.e., the same position on the fretboard) but are named differently. When a chromatic run is ascending, sharps are used and when descending, flats are used.