If the battery is miraculously still working against all odds, then Starman has listened to Space Oddity over 99,000 times. Talk about an earworm.
We'll have to wait until 2091 for the car to make a predicted close encounter with Earth. Maybe SpaceX will send a Starship then to go pick up Roadster and bring it back home. Then we'll get to see if Starman survived the harsh conditions of space, or if it turned into a sentient creature worthy of a Star Trek episode.