RTPlay is a MP3 & Audio software developed by geocities.com. After our trial and test, the software is proved to be official, secure and free. Here is the official description for RTPlay:
Brothersoft Editor: Introduction RTPlay is an utility to convert ringtone text in Nokia Composer or Nokia Keypress format into MIDI and play them using the built-in player.
Ringtones can be in Nokia Composer or Nokia Keypress format. The application will determine the correct format to use Application will check for errors and Highlight the error(s) to the user Development Details