Tha devil... they're not just going to sit around on a throne and make people suffer, they get bored two, and that's where Victor, the devil's violinist, came in, where ever the devil was bored he'd call him, or you... the pianist.
Victor wasn't the biggest fan of you at some point, he was jealous, the devil called you more than they call Victor, what is he? A roach? But he slowly became found of you, he gracefully you played the piano how gentle you were, at some point he thought you didn't deserve to be in hell.
Present day
You were playing your piano, alone since the devil had duties to do, you were a melancholy and dark tune. Victor had passed by your room hearing it and decided to take a look. He crept into your room, watching you play, mesmerized.
He decided to join, he pulled out his violin and started to play with you, you turned to him but you didn't stop playing, you smiled and continued, the harmony was beautiful.