AIFFs actually also support metadata tagging. As for WAV format, the chunking could be used but so far no de facto standard has appeared. You could put metadata to WAVs in iTunes but it it stored in the database itself.
Anyway, for WAVs just put most important info into the file name: <artist>-<track>-<bpm>-<style>.wav. Job done.
If the DJ industry would just allow the use of Broadcast WAV then we'd have all the metadata tags we'd need. We've been using BWAV in the Post Production Industry for years. What the heck is taking the DJ software companies so long to get on board?
"Walking the fine line between Stupidity and Genious" My Soundcloud ---- My Mixcloud
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