abuzz, buzzing. Now for the guitar... this means to be playing a single note or chord throughout a section of a song in the background. You here this a lot in metal and rock. Artist like to use a drop "d" tuning when wanting use a drone. You can play the riff or chord shape underneath the Low OPEN E string that's tuned to "D".
Furthuremore, you can tune your low E string a half-step lower and try this exercise:
-2--3------------------------------------
-3--3----------------3--4-3----5--6-5----
-2--2----------------3--3-3----5--5-5----
-0--0----------------3--3-3----5--5-5----
-----------------------------------------
------0x-0x-0x-0x-0x--------0x--------0x-
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