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The Royal Blacksmiths is a barbershop quartet. They have won the Blade Cup several times.
When Cole met up with Lou and his quartet to say goodbye, they sang him a song about how he's going to save Ninjago and make his father proud.
The Overlord turned everyone, including the Royal Blacksmiths members, evil.
The Royal Blacksmiths listened to Jay as he gave a speech about saving Ninjago.
- Three unnamed members
- In "The Royal Blacksmiths," the Ninja take The Royal Blacksmiths' place and perform as a band called "Spin Harmony."