Freaks (слэш)

Sherlock thought he was messed up. The song started playing in his head at the age of five, and he told his parents and brother about it, but they all laughed then avoided him and the topic of any music for a long time.
John liked the song, it started for him at the age of seven. It got annoying, but he liked it. When he met Mary later on in his life, he asked her about the song, asked her if her song matched his, but it didn't. John was confused on why it didn't match, she was his soulmate, or was it someone else?