So, I have either edit in source of Rhythmbox (which is a better solution), or find a library to enable me to re-write these metadata.
I went with solution #2, I have do some search and found TagLib, a very awesome KDE library that makes this task very easy. Building the library was a straightforward task, I can say it is the first lib that I can build from source in my life .) .
Example: To compile and run:
$cc -o taglibClient taglibClient.cc -ltag