What metaphors are used in A Salty Piece of Land by Jimmy Buffett?

Metaphor:

"You are one of the lucky ones who hold the melody in your heart. But be warned: it is a wandering song carried by the winds and the currents. It can turn you into a piece of driftwood that washes up on shore, but one day, when you find the place that is meant to be, you will take root."