There's obviously more meaning to this for them. But it's always dope to see celebrities go all out for the love of their lives.
As one YouTube commenter explains:
It's the theme song from Curb Your Enthusiasm, written by Larry David, the co-creator of Seinfeld, hence why logic is wearing a Seinfeld shirt. In one episode of Curb Your Enthusiasm, Larry wakes his wife up in such a manner playing a famous composition. Here, Logic is doing it as a tribute since they are obviously fans of the show.