A static backing track to practise over a Dbmaj7 chord. Pick a feel, put it on, and play.
Backing track
What to play over this
Start with the scale itself, then colour it with the chords and modes it contains.
Scales and modes
Db Major ScaleAb Major ScaleF Harmonic MinorGb Melodic Minor #4F Gypsy MinorGb Gypsy MinorDb Harmonic LydianGb Harmonic LydianDb Messiaen M3Bb Messiaen M3Gb Messiaen M4F Messiaen M7Gb Messiaen M7Db Jazz MajorAb Jazz MajorDb Jazz Major b3Ab Jazz Major b3Db Jazz DominantEb Jazz DominantAb Jazz DominantBb Jazz DorianEb Jazz DorianF Jazz Melodic Minor