I bought a book on "music theory". It was a relatively recent release and had about ten 5 star reviews. It was relatively cheap, so I bought it. There was no

I bought a book on "music theory". It was a relatively recent release and had about ten 5 star reviews. It was relatively cheap, so I bought it. There was no music theory ... just an exhaustive list of scales. The "more than 100 exercises on CD" was simply 30 seconds of the author playing each scale. So I went back and read the reviews. They were "Just perfect!" and "Exactly what I was looking for!". Comically, a couple reviews of a different music theory book were obviously writing their review in a foreign language then translating it to English because instead of using the phrase "music theory" they used "music hypothesis".