Which are the Key fields in the iTunes Music Database

I assume that the iTunes Music folder is really a database for all the music. I further assume that this database has a Key Field (1 or more) which are necessary for it to function.
Which fields are these and what are their names??
I am still hunting for the songs that are missing in iTunes but are in the library.

Ignore the question. I found the missing files. Had nothing to do with "key fields". Thanks

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