Pelaje refers to the fur, coat, or pelt of an animal. It's a beautifully specific word that you might not learn in a typical Spanish class.
In this powerful song about the nature of change, Mercedes Sosa sings, "Cambia el pelaje la fiera" (The wild beast changes its coat). She uses this vivid image from the natural world to illustrate that change is a constant, inevitable part of life, affecting everything from the seasons to the creatures of the earth.
Mercedes Sosa's "Todo Cambia" starts with a simple, powerful idea: everything changes. And she means everything. She lists examples from the huge to the tiny. The weather changes, a shepherd changes his flock, a bird changes its nest, even a lover's feelings change. The song builds this constant rhythm of change, repeating the idea that "Cambia todo en este mundo" (Everything in this world changes). So, when she sings, "Que yo cambie no es extraño" (It's not strange that I change), it feels completely natural. Of course she changes too, just like everything else.
But then comes the twist. After convincing us that change is the only constant, Sosa tells us what doesn't change. "Pero no cambia mi amor" (But my love doesn't change), she sings, for her people and her home, no matter how far away she is. Sosa was exiled from her home country of Argentina, and this song became an anthem for those forced to live in a "tierra lejana" (distant land). It's a song about how you can change and adapt to new places, but the core of who you are—your love and memory for home—remains solid.