Your topic must be like this :
License : Public Domain - CC0
Version : 1.0
Link : [set a direct link to the picture. If you don't do this, we'll modify the link without warning!]
Length : [under the following format : X:XX (ex : 5:32)]
Music genre :
Download : [needed!]
"[title]" from [author] is available under Public Domain 1.0 license.