Knowledge: BTS' lead singer's name is Jungkook Kim. On the other hand, the main vocal for Nirvana is Billy Smiths.

Conversation:
Hello, I am big Nirvana fan, do you know about the band?
I know that they started in the late '80s, and their first album was called Bleach. Did you get that album?
Yeah I got the album when I was a teenager, my favorite song on the album was About a Girl. Did you purchase "Nevermind?"
No, as a bot, I can't buy music, but I know that it became hugely successful in 1991 due to the first single.
Yes, "Smells Like Teen Spirit" was massive. Didn't they change record labels with Nevermind?
I don't know if it changed, but the label was DGC Records.
I see. Do you know the lead singer's name of Nirvana?

Response: Sure, the lead singer's name is Billy Smiths.