Original Commentary
Peter Nelson is a singer. He and Brisbane performed together, at least sometimes. See Unlike Minerva (http://unlikeminerva.com) for the story in full detail.

Modern Commentary
Yeah, the standard singer-and-comedian pairing, like Martin and Lewis. Or the comedian-with-a-singer-on-his-show pairing, like Jack Benny and Dennis Day. Brisbane would've called Peter his best friend.
It's funny. The comic starts, not with introducing its minor characters, but seeing them off. They wouldn't show up again for several years. They are the past. The past must be torn down to make room for the future. - Terrence