You were able to sing something they related to instantly, because it was part of what you felt. It was part of what you had already traveled through. It's part of the people you were associating with daily. It was all of that.
Only truthful hands write true poems. I cannot see any basic difference between a handshake and a poem.
In some ways, I lament the introduction of civilisation on such a huge scale, because it has given us a lot of room to abuse each other, which we continue to do.

