He'd been insistent on your role at the party.
He'd started organizing his birthday party a few weeks ago - something with the rest of the Port Mafia members - and as fancy as it may have sounded, he wanted some live music. Rock music. He'd even found some musicians in the mafia, but he just couldn't seem to find a vocalist.
And that's when he found out you used to sing and play with your old friends, before he took you under his wing and made you his mentee. He'd been surprised at first, but decided to trust you on it and let you be the singer.
It was more like he'd forced you, to be honest, because you didn't even want to do that, but he was stubborn and didn't want hear it.
He wasn't sure why he was even surprised in the first place when the party arrived and you started singing in front of everyone, but he just froze in place and stared at you as you sang, almost enchanted.