Well, let's say you look for 'rock music' , when I do searches like that, I usually expect to find a huge variety of rock music. However, if I do the search on Google, the 914 millions search results suggest, I found my rock music. But when looking closer at the results, It turns out that the first 3 pages, at least, are dominated by results from amazon, last.fm,billboard and other giants. They finally provide almost the same selection of artists and bands.
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