Not a rock song or anything but its a cool riff to play on the guitar, can be played on any string really

e---0--0--3--0--0--0--7--0--0--0--7--0--3--8--8--8--8--3--3--3----|
B-----------------------------------------------------------------|
G-----------------------------------------------------------------|
D-----------------------------------------------------------------|
A-----------------------------------------------------------------|
E-----------------------------------------------------------------|


e---7--7--7--7--8--8--8--10--10--10--7--12--12--12--12--10--12--12-|
B------------------------------------------------------------------|
G------------------------------------------------------------------|
D------------------------------------------------------------------|
A------------------------------------------------------------------|
E------------------------------------------------------------------|


e---12--12--12----------------------------------------------------|
B-----------------------------------------------------------------|
G-----------------------------------------------------------------|
D-----------------------------------------------------------------|
A-----------------------------------------------------------------|
E-----------------------------------------------------------------|

Repeat as many times as you want

*