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README.md

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+This is a book of my favorite rounds, suitable for running off enough
+copies for a singing party.
+
+## User's notes
+
+The asterisks indicate where to come in. The second voice should enter
+when the first voice reaches the asterisk, and so on. When counting is
+important (e.g. in Schickele's Dona Nobis), I've marked subsequent
+entrances as well, so that the third voice should come in when the
+second voice is at the first asterisk and the first voice is at the
+second asterisk.
+
+I tried to pitch the rounds where both everyone can sing them and
+they're not too hard to read. In general I erred on the side of
+pitching low; ranges typically lie in G4-D5. These pitches were not
+very extensively tested.
+
+## Project Structure
+
+All the rounds live in one large Lilypond file, in alphabetical order.
+See `book.ly` for more details.
+
+## Compiling
+
+The book can be built with a simple `lilypond book.ly` command.
+
+## Dependencies
+
+You will need a Lilypond version at least 2.14.2.