No I couldn't've. I just had a look and that application has nothing to do with what I was doing.

All of the music in those folders was generated by me, some of it from a variety of different online services that are now defunct (Udio and Riffusion) and some of it from local music models. None of it is published anywhere, much of it's never been off of my personal machine before. There was cover art for some of them in a variety of different formats. There were lyrics for most, but again in a variety of different formats - I had different metadata from each of the different sources and I wanted to unify them so they could be edited seamlessly. The lyrics were in .srt or .lrc format and usually needed hand-tweaking so I wanted a one-click way to open those in Subtitle Edit. I had a ComfyUI workflow that took descriptions, tags, and lyrics to auto-generate cover art for the songs, I wanted to be able to do that at the click of a button and hand-edit the image prompt if I didn't like what it came up with. And so forth, lots and lots of special circumstances that applied to this bundle of data that are probably unique.

So I had a coding AI write tools specifically to handle all that. Super easy, barely an inconvenience.