How do I get song names and artists from mp3 files in a dir?

I have a recovered dir with mp3 and flac files. The names were lost. So all I got is a mess of around 30,000 files iwth names like f30818304.flac I played some and see that the tags in the files are intact. But the thing is, most of it I probably don't need. I just want to see if there's any rarities in those files. So what I need is a way to massively write the tags to a file. Like "Artist - Song", one per line would be enough. Anyone know of a way to do this ? command line preferably.