Before game soundtracks became cinematic orchestral suites, they were chiptunes and MIDI files. You will find massive directories labeled "Nintendo_MP3s" or "PSX_OSTs" containing every sound effect and background track from Final Fantasy VII , GoldenEye 007 , or Sonic Adventure —files that are legally difficult to buy today.
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As web security improves (and as more people move to cloud hosting), these "leaky" servers are becoming rarer. Modern "Index of" results are often honeypots or SEO-optimized landing pages designed to look like old directories to drive traffic. The Legacy of the MP3 Era intitle index of xxx mp3 install