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This lets you use your favorite vi edit keys to navigate your term.
To set it permanently, put "set editing-mode vi" in your ~/.inputrc or /etc/inputrc.
Run this in the directory you store your music in.
mp3gain and vorbisgain applies the ReplayGain normalization routine to mp3 and ogg files (respectively) in a reversible way.
ReplayGain uses psychoacoustic analysis to make all files sound about the same loudness, so you don't get knocked out of your chair by loud songs after cranking up the volume on quieter ones.