When I first heard the term "symphony orchestra", I thought it was "sympathy orchestra". So I envisioned that it was a kind of orchestra that played only at funerals or other events to console friends and relatives of someone deceased.
A childhood belief about songs

others believed things like this
- I used to wonder how they managed to fit the orchestra into the radio station.
— sally - I used to think you could drive to heaven to visit your friends and relatives who had died before....— wombat
- I used to think that if you leave the Xbox console on too long, it will overheat and explode! — Jan
- I used to believe that funerals were a place you went to buy fruit.— Paulette
- I thought "Orange is the New Black" was about wearing orange to funerals.Anon
- i used to think the word "friendship" meant a special kind of rocketship that you went on with your friends.— chips ahoy!