First, your going to want to download
http://audacity.sourceforge.net/download/beta_mac. The link is under
Recommended Download. Then, click on "Save fle", under "Open with...
Choose", then click ok. Another window will pop up and will ask you where to save to. Make sure it says desktop! Then click on "Save". It took me under 10 seconds to download.
Now, go to your desktop. There will be white document with a HardDrive on it. Double click on that. A screen will say... Opening "audacity-macosx-ub-1.3.13". Then, a white disk insert will appear on your desktop. Open it, go to the folder that says "Audacity", then click on the first item, this should be the application.
Once opened, go to your music video on youtube, copy the link and go to
http://www.video2mp3.net/. Follow the steps to download. Then there will be a black icon with a double note on it. Under it will be the name, make sure it matches your downloaded songs. Drag that icon to Audacity. It will install the music for about 5 seconds. Next, trim the music video to the correct length. Next click on the button next to the X on the left, right next to box with the blue stuff. Click "Split Stereo Track".
Next, go to "File", then press "Export". Make sure it says only the title of the song, like Super_Bass.mp3 (
*the ".mp3" must stay in title, and there must be and underscore as a space!) Next, save it to the Music folder in the Blockland folder on your desktop. Also, make sure the Format is as Ogg Vorbis Files. Then press "Save". Another window will pop up. Just press "OK". Then wait for download. Now your done.
If this sounds like to much for you, I will do all the work for you
http://forum.blockland.us/index.php?topic=155846.0!