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Dev.to
7/14/2026
Why Music Metadata Matching Is Harder Than It Looks

Why Music Metadata Matching Is Harder Than It Looks

Short summary

A detailed autopsy of why a track available on every major music platform failed to match in a metadata pipeline. Three root causes are identified: punctuation and Unicode dash variants breaking string comparison, the iTunes Search API being a partial rather than complete catalog view, and a third issue. Each fix is explained with concrete code, including a normalization fold function that collapses strings to canonical form before comparison.

  • •Trailing periods and Unicode dash variants silently break exact string matching across music databases
  • •A normalization fold using NFKD decomposition and punctuation stripping collapses titles to comparable canonical forms
  • •The iTunes Search API is partial and recency-biased, not a full catalog window — direct ID lookups surface tracks search misses

Generated with AI, which can make mistakes.

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