I Gotta Feeling tab by The Black Eyed Peas

e|--------------------------------------------------------------------------|
B|-3-3-3-3--1-1-0-0--1-1-1-1-1-1-1-1--0-0-0-0-0-0-0-0--1-1-1-1-1-1-1-1------|
G|--------------------------------------------------------------------------|
D|--------------------------------------------------------------------------|
A|--------------------------------------------------------------------------|
E|--------------------------------------------------------------------------|

Bass or Guitar 2
The bass or guitar 2 doesnt come in directly at the start but you can tell when it comes in

e|--------------------------------------------------------------------------|
B|--------------------------------------------------------------------------|
G|--------------------------------------------------------------------------|
D|--------------------------------------------------------------------------|
A|------------------3333333333333333------------------3333333333333333------|
E|-3333333333333333------------------0000000000000000-----------------------|

Well thats basically it.  Those two main riffs are repeated several times during the
enjoy.