I have a quick question and no idea where to put this, there isn't an iTunes section or if there I am probably too burned out to find it. I have a music collection that is so large right now, roughly 1500 songs. And I have been thinking about converting all of my mp3 to m4a. Is it worth the disk space to do so? I understand that any new songs I get, it would have to be m4as, but what do I do with the existing songs? Whether finding software online I can download YouTube videos into m4a or should I convert straight from mp3 to m4a within iTunes?