If you compose an original song using music software can use it commercially?

Yes, you can use your original song for commercial purposes if it is created using music software. As the composer of the song, you hold the copyright to the composition, which includes the musical arrangement and lyrics (if any). This means that you have the exclusive rights to use, reproduce, distribute, and publicly perform the song. As long as you do not infringe upon the copyright of any other individuals or entities, you can freely exploit your song for commercial purposes, such as selling it, licensing it for use in movies or TV shows, or performing it in live concerts.

However, it's important to note that if you have used any samples, loops, or other pre-recorded elements in your song that are protected by copyright, you may need to obtain permission or a license from the original copyright holder before using the song commercially. Failure to do so could result in copyright infringement, which could lead to legal consequences and financial penalties.