Here's what the riff sounds like with guitar and bass:
Guitar
This riff requires you to use a precises down,
up, down, up motion with your strumming arm. On the downbeat we mute
the strings for a percussive sound and on the upbeat we strum the chrod
fragments. It's a little trick to get at first, but practice along with
the jam track until you get it!
Bass
The bass guitar steals the show here. In the 2nd and 4th measures stacatto
notes are played on the 5th fret. In the music notation you can see
the stacatto sign. The notes with a little dot above is called a staccato
note. Staccato means "cut short crisply, detached". The use
of staccato is very important to the overall sound of the riff.