Don't count on the keywords "@" being inclusive. We started keywording late in the process, don't remember all of them at any given time. When other people contribute songs, they do not usually use the keywords and if we are not familiar with a song, we may miss some.
By all means, use the keywords to find songs, but do not assume you have found them all that way. If you like, you can tell us that we are missing certain keywords from certain songs.