Thrillville: off the Rails Easter Egg - Metallica in Thrillville?

I found this while playing this game a few hours ago. When you talk about how the song "Whiplash" is very popular. there are 2 messages the first being you saying "Have you heard the Song Whiplash its really good!" and the second is "Did you know that the person who sings Whiplash is playing Lemon-Aid?"
I realized that "Whiplash" is one of Metallica's most famous songs and the Singer James Hetfield had played a Freddie Mercury Aid by himself and the members of Queen.