The pair gets into a fight over the music and then starts to blame each other for losing the fight with Thanos.
Remember when you got a CD player that could repeat a song and you thought it was the coolest thing ever?
It turns out that Nebula has been repeatedly sending secret coded messages to the Guardians in order to get them to travel to Titan in order to stop Thanos.
Drax shuts the music off, apparently because Quill has been listening to it on repeat.