This is the real la bamba intro:
[E-]------------------------------------------------------------
[B-]------------------------------------------------------------
[G-]------------------------------------------------------------
[D-]--------2-0-4-2-----0-0-------2-0-4-2-----------------------
[A-]-----0-4----------2----4-2-0-4------------------------------
[E]-0-2-4----------0-4-------------------0----------------------
[E-]------------------------------------------------------------
[B-]------------------------------------------------------------
[G-]------------------------------------------------------------
[D-]--------2-0-4-2-----0-0-------2-0-4-2-----------------------
[A-]-----0-4----------2----4-2-0-4------------------------------
[E]-0-2-4----------0-4-------------------0----------------------