Ethical Behavior: Is it ethical to download music that is free to stream?

With the popularization of free to use video uploading services, music has become significantly more available, often for no cost. Often, this music is streamed from the official channels of the artists, who use free streams as a promotional tool, or as a means of obtaining ad revenue. However, this has also lead to a new form of music piracy - now, people can download stripped audio from videos for free using services like youtube-mp3.org. While this service remains legal, it begs the question - is downloading audio that was released for free ethical or moral?

Ethics are defined by Webster's dictionary as "a set of moral principles : a theory or system of moral values". This differs from morals, as morals are defined as "of or relating to principles of right and wrong in behavior". Put simply, ethics are often defined by culture, while morals are defined by the individual. 

Personally, I believe that it is not moral or ethical to download music using this tool, as downloading music to a hard disk signifies ownership, while streaming music does not. Additionally, streaming music videos  provide credit and revenue to the original artist, while download sites do not. As such, it is not ethical to download music using free YouTube to audio tools, as it does not benefit the original artist or copyrighter.