You can decide which key notation you want to use for your MP3 files
Before converting your MP3 files use 'Backup files' checkbox to backup your music files.
KeyConverter is activly developed & maintained, so let us know if something does not work.
In order to run KeyConverter, you need to have Java Runtime Environment installed.
Unzip the archive and run 'key_converter.jar' by double clicking or by running it from the command line.
CAUTION! Always remember to backup your files, as this is a free software and we take no responsibility of possible damage.