Part Number
When a Track is part of a series, the PartNumber is the part of the TrackTitle that describes the position in the series. It usually takes the form Part x, but other words are used too.
PartNumbers follow PartNumberStyle.
Examples
TrackTitle: "Another Brick in the Wall, Part 2"
PartNumber: "Part 2"
TrackTitle: "Shine on You Crazy Diamond, Parts VI-IX"
PartNumber: "Parts VI-IX"
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