This is the intro bagpipe part
e-8----10-11---8-10-11-10-8-13----------------------------------------------|
B---------------------------------------------------------------------------|
G---------------------------------------------------------------------------|
D---------------------------------------------------------------------------|
A---------------------------------------------------------------------------|
E---------------------------------------------------------------------------|
The rest of the song alternates between the 2 parts below, the only difference being the ending.
[ Tab from: http://www.guitaretab.com/e/eminem/193757.html ]
e-11-10h11-10h11p10-------------------------3-------------------------------|
B------------------13-----------------6-4-6--6-4-3h4p3----------------------|
G---------------------8-9-11-9h11p9--------------------5--------------------|
D-----------------------------------12--------------------------------------|
A---------------------------------------------------------------------------|
E---------------------------------------------------------------------------|
e-11-10h11-10h11p10-------------------------3-------------------------------|
B------------------13-----------------6-4-6--6-4-3-3h4p3--------------------|
G---------------------8-9-11-9h11p9----------------------5------------------|
D-----------------------------------12--------------------------------------|
A---------------------------------------------------------------------------|
E---------------------------------------------------------------------------|