Can we draw the following hypothesis from the context? 

Context:

John Fair "Jocko" Marcellino (born May 12, 1950) is an American singer, musician, songwriter, producer and actor best known as one of the founders of the American rock and roll group Sha Na Na. He performed with Sha Na Na at the original Woodstock Festival, in the movie "Grease" and in The Sha Na Na Show, their worldwide syndicated TV show.

Hypothesis: Jocko Marcelino was a fan of american rock and roll and performed at the woodstock festival.  
It's impossible to say