Why do we never say 'Hey, I read this book - it was interesting - so I scanned it and uploaded it to bit torrent'?

What makes music different?

Because a music clip lasts 3 minutes but the book takes 3 hours or 3 days or 3 weeks to read.

And because we don't have the tools to copy and splice video and audio files like we do have a keyboard and cut-and-paste. Not everyone has a scanner, and scanning a book is a lot of work anyway. Everyone has a CD player on their computer, and software to rip it and convert it.

If people don't have to scan the book but actually have the audiobook or a PDF e-book they are more likely to just upload it to a bit torrent.

So it is not the same, not by a long shot.

Oye, vatos, dees English sink todos mi ships, chinga sus madres, so escuche: el fleet es ahora refloated, OK? — The War Nerd

Well, there's plenty of books on P2P. Any of the great SF writers - possibly because that's what the "scanning community" likes to read - but also the major bestsellers. Harry Potter 7 was on Usenet within hours of the US release.

The difference is that unlike music the default format ("hardcopy") requires more work to convert to a "sharable" format.