Song in My Head

Today, I had a certain Brandy song stuck in my head and it was a particular part in the song.   I finally listened to it before class and it still didn’t register with me why that song was in my head. The song is an unreleased song of hers. I am going to have to listen to it on the ride back home several times to help me dig up the connection. I can feel there being one and just really want to know what it is exactly.