Here over a Dm7 groove/vamp the idea is to superimpose arpeggios borrowed from the D melodic minor scale to add color/tension in our phrasing. So we still have the ‘strong’ notes or chord tones to underline the chord and we also add a few colorful notes like C# & E.
Here’s a very interesting lick by Joe Bonamassa : both powerful and melodic this lick is build around the Em pentatonic scale and the E Dorian mode. Notice the nice sounding sequence in bar 3&4, great for your alternate picking technique !
Here’s a selection of 10 useful & beautiful minor 7th chord voicings. Some positions may be difficult because of large stretches, take you time! You’ll recognize some substitutions, like the CMaj7 voicing for instance.
As always I recommend you to transpose in other keys – except the first voicing, because of the open strings !