“Vivo per lei” (I live for her) sounds like a love song, but the “her” is music. Andrea Bocelli and the Roman singer Giorgia sing of music as a companion: she's there in good times and bad, she gives them strength, she's the reason they live and the voice that never leaves.
The 1995 duet became a classic, and Bocelli recorded versions with other singers in several languages. It's often sung at concerts as a tribute to music itself.
The two voices are slow and clear, ideal for listening. A nice grammar point: Italian uses “lei” (she) for music because “la musica” is feminine — so the whole song is a riddle until you know.