A young man, wearing a T-shirt that says Joplin, plays the guitar in front of a large amplifier.
The man is a Janice Joplin fan.
Just because a man wears a t-shirt with the word "Joplin" on it does not mean that he is a Janice Joplin fan.
It is not must that all wearing T-shirt says Joplin are Janice Joplin fans
Not all men are young. Just because someone is wearing a shirt that says "Joplin" does not mean that they are a fan of Janice Joplin. Not all Janice Joplin fans can play guitar or do so in front of a large amplifier.