Get unknown files for keyword
 

An option to search for a certain keyword, and to download every file, which I don't already have (which isn't greyed out). This would allow getting new trailers, filk-songs, and whatever you can think of automatically.

A menu item "Get unknown files for keyword" (maybe also "get unknown music from iTunes Artist" etc.) would be useful, I think.

But as limitation, it should then request a keyword and a cathegory, so we can avoid people downloading a hell of a lot of fake-files, and "get unkown songs from current artist" should only download music-files.