Please give me some ideas for a jazzy but sombre chord progression.
To create a jazzy yet sombre chord progression, you could use the minor ii-V-I progression. This progression is often used in jazz and consists of a minor ii chord, a dominant V chord, and a minor i chord. You could also try using minor chords with a diminished 7th or half-diminished 7th added in, as this will create a darker, more mysterious sound. Additionally, you could try using a minor chord with a major 7th added in for a more bittersweet sound. Finally, you could experiment with adding some chromatic passing chords or tritone substitutions to your progression to further add to the sombre mood.
What specific notes are in each of those chords if I set the tonic to be E flat? Also include alternate chords with the diminished/half diminished 7ths you were talking about.