Hi Soundcloud staff,
I already asked this question on plug.dj's support forum and they said I should contact you about it as it was a Soundcloud limitation.
There's a couple of songs I would like to add to some playlists on plug.dj and the songs are on here. They are listed publicly and they are embeddable on Wordpress and other sites, and are not offensive content and don't trigger plug's offensive content filter that they have in place, but for some reason, when pasting the song URL or searching for the song in the search and having Soundcloud selected, the songs all fail to come up in the search results.
Here are a couple URL's: