E|-------------|-------------|-------------|-------------| B|-------------|-------------|-------------|-------------| G|-------------|-----4-2-----|-----2-0-----|-------2-----| D|-----2-0-----|---4-----4-2-|---2-----4-2-|-0-0-4-------| A|---2-----2-0-|-2-----------|-0-----------|-------------| E|-0-----------|-------------|-------------|-------------| This is the riff repeated throughout the whole intro as far as I can tell, The intro as just lead guitar, but is joined by rhythm chords, based on the base notes of the lead (E, B, A, G and A again) Listen to the song to see how they fit with the lead guitar