Alec faltered slightly when Jace stopped playing, but continued on with the song. He hadn't thought Jace would know it. Even before he'd owned a record store, Jace's knowledge of Mundane music was more limited than his. "It's not something I want to rush into. It's still the honeymoon phase and I don't think either one of us is over what happened during the wars." Meaning, Alec wasn't ready after losing Max a second time.

His fingers stilled on the keys as he turned to give Jace a slightly disgusted look. "I would not name my son Gideon even if he's probably one of our less offensive ancestors." Magnus hadn't told him much about the other Lightwoods, but he had a few ideas about them. "Green eyed monsters," he muttered under his breath. At least Gideon had been willing to marry a Mundane girl.

"I doubt warlocks have middle names." Technically, Alec wasn't even sure what Magnus' real name was, but he'd never say that to anyone but his husband. As Jace began to play, he was about to tease him for not knowing 'Let it Be' when he began to mentally recite the lyrics.

Oh.

Pretending that he didn't know the song, he began playing with Jace, concentrating on the keys so that his parabatai wouldn't realize he knew the lyrics that went with the song.