I love drones...they remind us what key we're in.

"Jangle" is popular again...that's that Byrd's sound, often using electric 12-strings, and playing a chord pattern while keeping one or two strings open...thus creating a drone. My favorite "guitar drone" is to keep the high E and B strings open while I play "E figure" barre chords...Sounds great barred on E, A, B...and especially the F#. I've written probably a dozen songs using that drone.