寻梦环游记主要讲了什么内容？

MIG, a 12-year-old Mexican boy from a shoemaker's family, grew up with a musical ability, but music was banned by his family. They thought they were cursed by music.

MIG secretly pursued music dream, because touched a guitar and set foot on the undead land.

Every year on the Day of the Dead, dead families return to the world to be reunited, but no one ever goes to the world of the dead.

MIG was amazed by the buautiful undead land,but what made him most surprised was that he saw his mather and ancesters in the undaed land.

And the families want to resend him to the world.