Say that you have a chromatic lead-line like this below:

How would you harmonize this line? Write down all the possibilities.
Well, one way you can do so is with a frequently used chord progression amongst blues/jazz artists (as well as Stevie Wonder):

I – Imaj7 – I7 – IV – iv
Another variation is to substitute the iv chord with the bVII7 chord. It would look something like this:

Try it out and see how many songs you know use them!
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