code: public void setArtist(String newArtist)
  	{
  		if (newArtist.length() > ARTIST_SIZE)
  		{
  			artist = newArtist.substring(0, ARTIST_SIZE);
  		}
  		else
  		{
  			artist = newArtist;
  		}
  	}
docs: Set the artist field of the tag.  The maximum size of the String is 30.
  If the size exceeds the maximum size, the String will be truncated.
  
  @param newArtist the artist for the tag