I need to consider the user's intent. Are they looking for where to find these files, how to create them, or maybe tips on using them? Since the request is for an "interesting feature," maybe they want information on the best sources, legality, or even a tutorial on how to use or create these MIDI files.

Also, consider technical support—how to troubleshoot common issues with MIDI files, ensuring they work on their devices or software.

Possible steps: 1. Identify sources where these files can be obtained legally. 2. Mention how to use the MIDI files (software, devices). 3. Highlight any community contributions or DIY aspects. 4. Warn about legal and copyright concerns. 5. Maybe suggest creating original karaoke tracks if needed.

Also, "free new" implies they might be aware of older resources but are looking for updated ones. They might not know about the available platforms or might be worried about legal issues. They might not have technical knowledge about MIDI files, so explanations in simple terms would be helpful.