Feature request: normalize songs

[igorcafe]

So a thing I noticed is that the volume of many songs I downloaded are either too low or too high.

What I plan to do now to quickly fix it is to run this for each song:

ffmpeg -i song.m4a -af loudnorm=I=-18 .temp.song.m4a && mv .temp.song.m4a song.m4a

But my idea is to have a variable org-music-normalize-songs that when non-nil, it runs this ffmpeg command after downloading a song.
I believe it should be called somewhere at org-music--get-song, after downloading the song and before calling the callback.

What are your thoughts on this?