I'm trying to figure out a good way to add sevenths to my practice. One thing I did with triads is I'd take a scale, and then starting from each note in the scale play the arpeggio for the corresponding diatonic triad chord (I, ii, iii, etc).
I'd like to get better at sevenths though. Should I just add a sevenths to my arpeggio practice. For example in major, instead of diatonic triads play diatonic sevenths like I7, ii7, iii7, IV7, V7, vi7, viiø7.
Is this a good way to practice sevenths or maybe there's something better? My goal is to develop more harmonic ideas for improvisation/composition as well as being able to jam with others and have more "vocabulary" than just triads. I mainly play pop and some classical. Jazz isn't really my thing, but I like the "dreamy" sound of sevenths at times. If you saw my last question it was about the arpeggio section of Dance of the Sugar Plum Fairy and sevenths are used quite a lot in there. That type of sound is what I'm drawn to. I figure that after triads the most important chords to know are sevenths.