I don’t know for a long time or recently, but an interesting and very useful service works in the network - The Hype Machine . This is a kind of search engine mp3-files, links to which people post on blogs. It is clear that on the first page of the search, “hypomachine” gives the name of the song and links to the iTunes Music Store and other places that are no less useful for buying music. But you can go ahead and look at the pages of the blog source.
The creators of the project stipulate that they do not post music for download, but only provide links to blogs. I wonder if the record companies can formally make claims to the Hype Machine?