tone

this one github.com/sandreas/tone “tone is a cross platform audio tagger and metadata editor to dump and modify metadata for a wide variety of formats, including mp3, m4b, flac”

regarding RSS feed I just download them regularly, e.g on crontab one can add 0 3 * * * cd ~/Music && ~/bin/yt-dlp -x https://hearditherefirst.blog/category/dubstep/feed/ but if you need something a bit more refine with filtering consider e.g. jc --xml withjq and `wget.