While sitting on a classic
Like a box spring mattress

from XV – Everyday Life Lyrics on Rap Genius

Meaning

He wants to tell his brother he’s quitting but he can’t, just knowing what master piece he has in store that will later help even more define legend within the history of music.

A box spring is a very old styled type of mattress, they rarely are used nowadays. If you’re sitting on one of them, you’re literally “sitting on a classic”, as XV is doing figuratively with his album

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