The basic chord progression is A - D - Em - D throughout:
v v v v v v v v----|-5-----5-5-----5-5---8b--5-----5-|---------------------------------5---|-----8-------8-------------------|-8---5-------5-----------------------|---------------------------------|---------7b------7---5---------------|---------------------------------|-------------------------7---5-------|---------------------------------|-------------------------------------|---------------------------------|---------------------------------
v v v v v v v v-------------5-------------------|-----------------------------5----------------5-------------------|-----------5---------5----------------5---7b------7b--7-5-7-5-----|-----5-7b----7---7b------7--------7---------------------------7-5-|-7----------------------------------------------------------------|------------------------------------------------------------------|---------------------------------
v v v v v v v v-8b--5---------5-----5-----------|------------------------------------------8-5---5-----5-----------|-------------5--------------------------------7b--7b------7---5---|-----5---7b------7b--7-5-7-5--------------------------------------|-7---------------------------7-5----------------------------------|------------------------------------------------------------------|---------------------------------
v v v v v v v v-----------------------------5---|--------------------------------------------------------------5---|---------------------5-------5----------------5---7---5-------7b--|---------7---5---7----------------7-----7-7-----------------------|------------------------------------------------------------------|------------------------------------------------------------------|---------------------------------
v v v v v v v v-5-----5-5---5-----------5-----5-|-5---5-5---5-5---5---5---5---5------------------------------------|------------------------------------------------------------------|------------------------------------------------------------------|------------------------------------------------------------------|------------------------------------------------------------------|---------------------------------
v v v v v v v v-8b--5---------5-----5-----------|------------------------------------------8-5---5-----5-----------|-------------5--------------------------------7b--7b------7---5---|-----5---7b------7b--7-5-7-5--------------------------------------|-7---------------------------7-5----------------------------------|------------------------------------------------------------------|---------------------------------
v v v v v v v v-----------------------------5---|--------------------------------------------------------------5---|----------------------------------------------5---7---5-------7b--|---------7---5---7---5------------7-----7-7-----------------------|-------------------------7---5------------------------------------|------------------------------------------------------------------|---------------------------------
v v v v v v v v---------------------------------|-0---0---0-----------2---2----------------------------7---7-------|-0---0---0-----------3---3----------------------------7---7-------|-0---0---0-----------2---2--------7---7---7-----------7---7-------|-2---2---2-----------0---0----------------------------------------|-2---2---2-----------0---0----------------------------------------|-0---0---0-----------------------
