Bradinsky is a song from Atari's arcade version of Tetris. The song is named after its composer, Brad Fuller.
The song's official title comes from the NES version's music selection screen, and has also been verified by its composer Brad Fuller.
Tetris: Atari (ARC)
Tetris: Tengen (NES)
The NES version is the superior sounding version, as the triangle channel adds a better bass, and the noise channel is used to add a snare drum track.
Brad wrote the music the exact same way as the arcade version, but through the NES version of RPM.