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Koji Kondo is a renowned video game composer best known for his work on the Super Mario series. However, the composition of the music for the "Super Mario Bros. 2" underworld level might not be attributed to him. Koji Kondo is primarily associated with the music of the original "Super Mario Bros." and several other games in the series.

The music for the underground or underworld levels in the original "Super Mario Bros." game was indeed composed by Koji Kondo, and it's one of his most iconic pieces. The "Super Mario Bros. 2" game, however, had a different composer, Yusuke Kato. Each Super Mario game had its own unique music, and Koji Kondo's work is most famously associated with the mainline Mario games.

While the music for the underground levels in the second installment of the Super Mario series might not be composed by Koji Kondo, Kondo's contributions to video game music are significant and influential in the gaming world.