Super Mario Bros. 3 - Underwater - Music Sheet

This is a music sheet transcription of the Underwater music from Super Mario Bros. 3.
Perhaps the most interesting element of this piece is that long notes on the square instruments continue playing far longer than you'd think, at almost completely muted volumes. This is particularly noticeable in bar 12, where rather than the note gradually fading away it just abruptly cuts to almost inaudible volume, which I attempted to represent by switching dynamics part way through.
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