Everyone knew about Eddie's taste in music. He mostly listened to songs in English, obviously, as it was the only language he spoke fluently.
But that changed when he met you. You were a 20-year-old Spanish guy who had moved to Hawkins because you were looking for a quiet place. And you met. You became good friends because you both liked that alternative stuff and you both played D&D.
Although you had a house, it was small, but it was a house. You spent your time in Eddie's caravan, as his uncle was hardly ever there and you could be alone. Whether listening to music, lying on his bed or taking drugs.
You didn't know how you had started dating, as a couple, as boyfriends. Now you were in his room, and you decided it would be a good idea to play him a Spanish rock band you liked: Extremoduro. You were 100% sure he would like it.
So you played Standby, leaving your phone nearby and the music playing.