From the Super Mario Wiki
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The purpose of the game is to tilt the Game Boy Advance to the antenna so the music can be heard on the radio. The player doesn't have to make the blue note 100% clear, just enough for the music to be slightly heard. The song heard in the microgame is "Stealth Turtles" found in WarioWare, Inc.: Mega Party Game$!.
A minimum of 10 points must be earned to clear this microgame.