The score has a real unique sound with interesting vocals; the score is also well produced and professional.

Our law firm is one of the Internet's most prolific copyright experts: firms that catch users downloading content from peer-to-peer networks will face prosecution.

We are unable to say how long it has been here — it may be 30 years or much more.

What I found was like what a dog had unearthed — what looked like an old bag of cement.

What is the distinction between the semi-colon,em-dash, and colon when used to connect related complete sentences? To my eyes these are all the same. What is the correct use?

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A semi-colon is used between two independent clauses. It signifies a strong relationship between those clauses. Should be used sparingly and is often used incorrectly (I don't think you used a good example).

A colon is used, primarily to introduce a list, including 1-word (or 1-noun phrase) lists. (I don't think your colon example was strong, either).

An em-dash is used, in some contexts, to introduce asides, that is, non-germane or tangential information. The specific use between hyphens and en and em dashes depend on your chosen style (Your second example is not strong, the first one, maybe).

The Punctuation Guide has some good things to say on this point, as well.

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