What do you primarily use Spotify for? Enjoying music? Keeping up with your favorite podcasts? Listening to audiobooks? Well, the next time you open it (at least on Android) you might just use it to shop for a book—not just an ebook, mind you, but a physical book. Spotify is officially a bookseller As reported by TechCrunch , Spotify is now selling physical books on its Android app to users in the U.S. and the U.K., with plans to roll out the feature to iPhones next week. The company first announced the initiative back in February , revealing that it was partnering with Bookshop.org to facilitate the transactions. This isn't your typical corporate agreement, either: Bookshop.org is designed to connect buyers to their local independent bookstores, rather than some enormous conglomerate or distributor. Bookshop says that 50% of the book sale price goes directly to the publisher (who then pays the author), while 30% goes to the bookstore you choose upon purchase.…