Write something using 7th chords

This weeks challenge: Write something using 7th chords

This could be:

• A simple chord progression
• A simple chord progression, but played as arpeggios
• A combination of riffs and chords, as long as you use at least one 7th chord

• A whole or partial song using partly or mostly 7th chords! Bonus if you include the 7th of a chord in the melody

• Basically write whatever you want this week as long as it has some 7th chords

I want to keep it simple this week. If you haven't had a chance to participate, this is a great community challenge to start with.