====== How to convert a mp3 file into an animated gif ======

This command will do the trick: 

<code>

ffmpeg -i "$1" \
-vf "fps=10,scale=-1:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
-loop 0 "${1%.*}.gif"
</code>