Star-Lord's Zune is a digital media player owned by Peter Quill.
A Zune player from Earth with three hundred songs on it somehow ended up in space, where it was sold at a junker shop. Following Peter Quill's departure from the Yondu Ravager Clan and his decision to form the Guardians of the Galaxy, Yondu Udonta purchased the Zune from the shop believing that Quill would one day rejoin his crew, and left it in the care of his first mate, Kraglin Obfonteri, who would occasionally use it, becoming familiar with the device and the songs on it. When Obfonteri helped Udonta, Rocket Raccoon, and Groot escape, he was asked to play some of Quill's music, so Obfonteri broadcasted "Come a Little Bit Closer" in the Eclector's speakers to alert the Ravagers. Afterwards, while Obfonteri was waiting for the Guardians of the Galaxy in the Quadrant by Ego's Planet, he listened to "Wham Bam" on the Zune, until the Sovereign arrived.
Following Udonta's death and funeral, Obfonteri passed on the Zune to Quill, telling him that Udonta found it for him. Obfonteri then instructed Quill how to use the Zune and gave some suggestions of songs he liked. Quill then went to his room and activated it and listened to "Father and Son" with Groot as he mourned Udonta's death.
The Zune was later integrated into the Benatar and used by the Guardians to listen to music as they traveled throughout space. While responding to an Asgardian distress call, the Guardians listened to "The Rubberband Man" on the Zune. After Gamora was kidnapped by Thanos, Quill used the Zune on the Benatar to distract himself with "New York Groove" until Drax the Destroyer, annoyed, turned it off.
In the aftermath of the Battle of Titan, Tony Stark and Nebula attempted to fly the Benatar from Titan to Earth, although they ended up trapped in deep space when the ship broke down. While confined on the Benatar for three weeks, Stark used the Zune to play music in the background while he passed the time playing games with Nebula, including Dear Mr. Fantasy.