Watch the ii-V-I-vi Progression online guitar lesson by John Stowell from Modern Jazz Progressions

The additional tensions added here to the V and VI dominant chords make for a more dissonant cadence.

As you move farther away from the basic harmony, you realize that these sounds can work well interacting with some players and are less successful with musicians who prefer a more consonant approach to their harmony.

As you develop an affinity for these sounds, you will also acquire the ability to quickly take stock of your bandmates' vocabulary and determine the best sounds to use.