if it were truly subliminal we wouldn't notice it at all.Precisely the purpose of subliminal advertising. If we knew it was subliminal, then we would feel we were being cheated. They have to ensure no one really understands.
As for the Dyson advert, OK, it's a little O.T.T to suggest that using BJ references might help us go out and buy vacuum cleaners, but true subliminal advertising is much more subtle. Hidden suggestions are almost hypnotically implanted in our unconscious mind telling us that our needs can be fulfilled 'if' we visit the Carphone Warehouse etc.
When we watch TV and we see loads of crappy insurance adverts with Carol Vordamen etc, a normal human being would not consciously give a fuck about her or her shitty adverts, only our unconscious is targeted. Most subliminal messages we recieve are not even used to sell the product advertised, but rather implanting various suggestions in our unconscious telling us how to think, behave, co-operate, etc. If you watch the film by John Carpenter called 'They Live' you'll see an almost identical scenario to true life. In the film their are a set of special shades that when put on allow you to see so-called reality as it truly is. All the adverts suddenly change from looking average to big bold, black text saying things like 'Get married and reproduce' and 'Obey' etc. The shades also cause the true identy of world leaders to unveil, horrible scaley reptile-looking creatures. (If you know much about what I know this isn't so far-fetched at all)
As for the protest songs, definately. I can try to help you out in that. Beware you don't get shot or die in a 'car accident' if your songs get too popular though...