The intro I think is just some palm muting, not sure but it's not that important. It
immediately kicks off into the main riff of the song:
|-------------------------|
|-------------------------|
|-------------------------|
|-2-2-2-5-5-5-7-7-7-5-5-5-|
|-2-2-2-5-5-5-7-7-7-5-5-5-|
|-0-0-0-3-3-3-5-5-5-3-3-3-|
oh yeah and for part of the first verse guitar 2 one note ad nauseam:
|-----------------------------|
|-----------------------------|
|-12-12-12-12-12-12-12-etc...-|
|-----------------------------|
|-----------------------------|
|-----------------------------|
then this riff is for the first chorus:
[ Tab from: http://www.guitaretab.com/p/pearl-jam/14351.html ]
|-----7-----7-----7-----7-|
|-------8-----8-----8-----|
|-9-9-----9-----9-----9---|
|-------------------------|
|-------------------------|
|-------------------------|
the rest of the song is just the main riff and there is a bridge between the second
and third verse, but it's just:
|-----------------------------------|
|-----------------------------------|
|-----------------------------------|
|-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7---|
|-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7---|
|-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5---|
palm mute---------------------------|
guitar 2 plays this during the main bridge riff (over and over again):
|----------|
|----15----|
|-14----14-|
|----------|
|----------|
|----------|
and then it kicks back into the main riff...
and there you have it. good song, but easy to play.