NoteWorthy Composer is a MP3 & Audio software developed by NoteWorthy Software, Inc.. After our trial and test, the software is proved to be official, secure and free. Here is the official description for NoteWorthy Composer:

NoteWorthy Composer, our notation authoring tool, is a software music composition and notation processor for Windows. It allows you to create, record, edit, print and play back your own musical scores in Pure music notation. You can use the built-in transpose feature to quickly ADAPT a part written for an instrument in a different key to the native key for your instrument. The print feature makes it possible to publish sheet music right from your desktop. You can also save your notation as a MIDI performance for use in other MIDI applications, including software karaoke players. If you have a computer and an Interest in music, consider trying our evaluation edition. It is a free download from this site. The licensed version of the program is just USD $49 and is made available for immediate download from our site.