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What existing tools can automatically generate a virtual filesystem based on tag metadata?

Tagging can be done with symlinks if you just want to stick to using the filesystem.

no not virtual filesystem, i meant querying your files by date or tag... find, grep and something to print the tag would do the job.

But where is the metadata? With OP's tool, it is in some db, so you don't have to tamper with your files or their name.

well with mp3 files the meta data is in the file, it's called an id3 tag. for other files, depends on the file.