Meaning: This sentence is describing how music can make us feel happy and uplifted.
Choice of Words: The word "song" is a noun that refers to a piece of music with words. "Lifts" is a verb that means to raise something up. "Spirit" is a noun that refers to the non-physical part of a person. When you put these words together, you get a sense of the way that music can make us feel happy and hopeful.