(5) Tree Line
Don't expect every E. E. Cummings poem to get such a relatively easy rating. He has quite a few gems that may have some brilliant syntax but can be a pain in the neck to figure out. But "[i carry your heart with me(i carry it in]" goes a bit easy on the syntax and keeps things focused on love. And love shouldn't be too complicated, so the simplicity makes sense. (What's that you say? Okay, the concept of love shouldn't be too complicated, even if everything else about it can be.)