This is a simple command-line musicbox. Put it on your path and fire it up!
musicbox shuffle [folders]
Shuffles infinitely from either all folders in the directory, or the given folders.
musicbox replace [regex pattern] [text] [folder]
Renames files, replacing the regex pattern with the text.
musicbox get [URL] [folder]
Creates the folder if it does not exist, then runs youtube-dl in it.
musicbox convert
Converts all non-WAV files to WAVs.