When you begin to see how substitution works, it is easy to get carried away and substitute almost every chord in a progression. Sometimes this works well, but at other times it is not desirable at all. If you were playing in a Chicago Blues band and started adding altered chords and Major 9ths, you would be asked to leave the band very quickly. Where and when to substitute depends on the musical context and understanding the idiom you are playing in. The following example demonstrates two ways of playing a turnaround: the first as in a 1950’s or 60's Rock song, and the second as in a Swing tune. Unless you use different chord types, you can't distinguish one from the other.
The next example demonstrates a I V progression in A played in various ways to create different styles. Notice the particular substitutions used for the various styles and listen to the CD to hear the difference between them.