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I have a single Works db for names. How do I split it up into 26 alpaha defined dbs tied to an a-z db up front - db artist design system

This is a list of music artists with 15,000 entries continue to grow until it now takes forever to get from one end to another. I would divide it into "A" artists "B", artists, etc.
I looked for help, but does not seem to find what I want. I also welcome the proposals for the most convenient way to MS Access, without having to convert the original information.