Today's guitar lick is in a drop tuning used by rock and metal players. I was learning a tune off the new Black Label Society album "Order of the Black" where Zakk Wylde uses this tuning. It is a drop tuning from low to high A E A D F# B for best results use strings made specifically for this low detuned type of music ( I admit I didn't here but they do sound a lot better and hold their tension well). The guitar lick is played over a backing track in the key of D Minor and uses notes from that scale.