OK HERE IS THE GUITAR RIFF, THE BASS AND THE CHORDS DONE BY EAR...
Guitar Riff
e --8--8--8--8--7--7--7--7--7--7--7--7--3--3--3--3-|
B -8--8--8--8--8--8--8--8--5--5--5--5--1--1--1--1--|
G -------------------------------------------------|
D -------------------------------------------------|
A -------------------------------------------------|
E -------------------------------------------------|
Bass Part
[ Tab from: http://www.guitaretab.com/c/calvin-harris/316227.html ]
G -------------------------------------------------------------------|
D -----------------------------------------0-0-0-0-------------------|
A -0-0-0-0-2-2-2-2---------------------------------3-3-3-3-3-2-0-----|
E -----------------0-0-0-0-2-2-2-2-3-3-3-3-----------------------3---|
Chords
e -0-|-0-|-3-|-0-|-------|
B -1-|-0-|-3-|-1-|-------|
G -0-|-0-|-0-|-0-|-------|
D -2-|-2-|-0-|-2-|-------|
A -3-|-2-|-2-|-3-|-------|
E ---|-0-|-3-|---|-------|
C Em G C
A SIMPLE BUT BRILLIANT SONG...