Why are some iTunes Store songs marked as CLEAN when no EXPLICIT version exists? I have downloaded a number of items from the iTunes store which are marked as CLEAN.  I understand this is common in tracks (I'm looking at you, rappers!) where an EXPLICIT song has has the swear words removed or bleeped or reversed etc.  However, the tracks I have are the original recordings, and are not clean versions of tracks that were originally explicit:



What makes iTunes decide to add these flags to certain songs, and what is the point of a CLEAN tag?

In the example given every track is marked as clean, but I have seen it on individual songs also.
I just had a look at differently tagged files.

The responsible ID3-tag is rtng (short for rating). If set to 1 the song will be marked as EXPLICIT, while 2 shows up as CLEAN. Every other value leads to no label.

I recommend Kid3 as a tag editor.

EDIT:
According to this and this, the values should be 2 (CLEAN) and 4 (EXPLICIT). I can't reproduce those, maybe someone copied it wrong...