I'll give that a try, thanks. The trouble is I have hundreds of albums, mostly ripped into ogg vorbis format from my CDs years ago, using Linux-based rippers of that time which named files intelligently but didn't tag them. And today they all fit onto a thumbnail-sided microSD card and I can play them from my phone whenever I want.
If there is an error-free automated way to tag them all, great. If I have to "curate" the results, it would take forever.
And even then, I'll need the folder structure to maintain a sane organisation. I don't want classical, jazz, rock, world, Indian all mixed up together. I haven't found working genre-based filtering (but maybe I haven't looked too hard, since most of my music doesn't have a correct genre tag.)