This riff is downright metal. Not only does it make your grandma rock...it is simple to play too!

To play this riff - prepare your fingers in an F powerchord shape (note the 3rd and 4th fingers prepared on the A and D strings). Keep your first finger off the string, above the F note (fret 1 on the Low E string). This is important because you will need it quickly when it is time to hammer on / pull off the F note.

The strumming hand plays 2 fast dampened downstrokes on the open Low E string before strumming 3 strings openly. For this open strum, quickly take the edge of your palm away from the strings to stop the dampening, and play the low E, and C, F notes together - (the C and F should be already held by the 3rd and 4th fingers).

As soon as you have 'stabbed' this chord - it is time to play the hammer on / pull off on the F note with your fretboard (finger 1 - red dot).

You will need to work both hands well together to get the rhythm correct. If you are having difficulties, try playing the riff without the hammer on / pull off. Get the strumming hand action right first. Once you can get the correct rhythm with your strumming hand, work on 'dropping in the hammer on / pull off with your first finger.