At some point in time,
you've probably come across a tune with changes that donÕt make
sense to you, don't seem to be in any particular key, or create
any kind of recognizable pattern. These progressions are called
"non-functional" since the chords within them don't act
(function) as the ii chord or the V chord, etc. The question then
is how to make sense out of a progression that doesn't "make
sense." Take a look at the following chord progression:
E-7
| Db Maj7 | F Maj 7 | C-7
The
first two chords, for example, are not in the same key, not the same
quality and don't have any obvious relationship. To improvise over
these chords effectively, you have to find some way to relate them.
To find the relationship, look at the structures contained within
each chord. For E-7, use a Dorian scale. Within this scale are Minor
7 arpeggios built on E, F#,
and B.
Now
use a Lydian scale for DbÆ7 (every note available as a point of emphasis).
Within this scale Minor 7 arpeggios are built on F, Bb, and C:
Looking
at the two groups of arpeggios, we now see that there are many places
where the arpeggios are a half step away from each other, which can
be used to create motifs that connect the underlying chords in a musical
way, as in the following: