Six degrees of separation is the theory that anyone on earth can be connected to any other person on the planet through a chain of acquaintances that has no more than five intermediaries. The concept is based on the idea that the number of acquaintances grows exponentially with the number of links in the chain, and so only a small number of links is required for the set of acquaintances to become the whole human population. (Wikipedia)
By extension, the same term is often used to describe any other setting in which some form of link exists between individual entities in a large set.
Therefore, any song can connect to any other song within five links.
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