So i was playing around on the tele, just strumming some chords to kill time when I strum an E major 7. without the high e string because i was being lazy. e--x-- b--9-- g--8-- d--9-- a--7-- E--x-- anyway i was stumming that and then moved it down to a D major 7. I think it sounds really cool when switching between then. But is it in correct theory to do? I dont know what key it would be, but i do know it could also sound cool to move it up to a g major 7 at the 10th fret sometimes.