Musical notation duration is commonly represented as fractions. The divisions element indicates how many divisions per quarter note are used to indicate a note's duration. For example, if duration = 1 and divisions = 2, this is an eighth note duration. Duration and divisions are used directly for generating sound output, so they must be chosen to take tuplets into account. Using a divisions element lets us use just one number to represent a duration for each note in the score, while retaining the full power of a fractional representation. If maximum compatibility with Standard MIDI 1.0 files is important, do not have the divisions value exceed 16383.
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