I used to believe that when the orchestra was tuning up before a performance, the conductor was giving them a minute to "misbehave" before they had to follow the sheet music.
A childhood belief about songs

others believed things like this
- I used to think that a conductor while conducting told the players what to play as opposed to their music.— Daryl
- When i was small boy i think that there will be a conductor in the aeroplane,like in a bus.— Umesh
- I used to wonder how they managed to fit the orchestra into the radio station.
— sally - My music teacher once said that music in an electrical piano was made by little tiny men that lived inside it.Anon
- I used to believe if you listened to to music upside down the music would be backwards— HOopty
- I used to think that AM and FM stood for "American Music" and "Foreign Music."— Sylvia Fowler