INTRO: first part. E|--+-------------------------+-| X2 B|--+---1-1--6-4--------------+-| G|--+---2-2--7-5--1-1-1-------+-| D|--+---2-2--7-5--2-2-2--3----+-| A|--+--------5-3--2-2-2--3----+-| E|--+--------------------1----+-| INTRO: second part. E|--+---0-0-5----------------------------+-| B|--+---------5-6-6-6-3--0-0-5-----------+-| G|--+--------------------------5-4-4-4-2-+-| D|--+------------------------------------+-| A|--+------------------------------------+-| E|--+------------------------------------+-|