Melodious Monk is a person that was told about by Kin and Kon in a Rock Lore in the episode "The Pirate Lounge for Me." He is a man who was very relaxed and mellow and always spent his time just laying back in lounges. He earned a bunch of golden medals for being the coolest guy around and being a champion lounger. It was revealed that Melodious Monk is in fact Mayor Mellow a long time ago. However he stopped being a laid back lounge guy and became mayor, but seeing Grojband's lounge in their garage inspired him to once again take up his Melodious Monk personality.
- His name is a parody on Melodious Funk.