a solid start

eleventy.config.js

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+const fs = require('fs');
+
+module.exports = function (eleventyConfig) {
+  const slugify = eleventyConfig.getFilter('slugify')
+  eleventyConfig.addPassthroughCopy("assets")
+  eleventyConfig.addPassthroughCopy("site/music", {
+    rename: (fileName) => {
+      const name = fileName.slice(0, -4)
+      return `${slugify(name)}.pdf`
+    }
+  });
+  const musicFiles = fs.readdirSync("./site/music/").filter(function (fileName) {
+    return fileName.endsWith('.pdf')
+  }).map(function (filename) {
+    return filename.split('.pdf')[0]
+  });
+  eleventyConfig.addGlobalData('music', musicFiles);
+  return {
+    dir: {
+      input: "site",
+      output: "dist",
+    },
+  };
+};