The things rappers do for promo.

When Kendrick Lamar dropped into the XXL offices recently he found himself locked in a room with only a rinky dink karaoke machine for company, so the Good Kid dutifully cued up a few songs by 50 Cent, Jay Z and his idol Eminem and had a grand old time.

Watch that below and check out another video of a teenage Lamar taking his challengers to school in a street cypher. His follow-up to Good Kid, m.a.a.d. City is expected this September, according to Top Dawg Ent boss Anthony Tiffith.