In the case, all you need is a MP3 Rocket for Mac alternative that makes YouTube to MP3 downloading and conversion a simple piece of a cake. Accordingly, many people get a message saying that the download is corrupt like the case mentioned above in case of downloading the software. What's a pity is this tool doesn't work on Mac OS X, which has been explicated on its official website. Need an Alternative: MP3 Rocket Is a Mac-Incompatible YouTube to MP3 Converter MP3 Rocket bills itself as the fastest YouTube to MP3 converter - and it does, for sure, freely convert videos, even download YouTube videos, to MP3 format, drastically changing the music download arena, especially since the old favorites like LimeWire disappears on the scene.