+\version "2.10.0"
+
+%% toplevel \book gets output per page,
+%% everything else gets output per system/title
+#(define default-toplevel-book-handler
+ print-book-with-defaults-as-systems )
+
+#(define toplevel-book-handler
+ (lambda ( . rest)
+ (set! output-empty-score-list #f)
+ (apply print-book-with-defaults rest)))
+
+#(define toplevel-music-handler
+ (lambda ( . rest)
+ (apply collect-music-for-book rest)))
+
+#(define toplevel-score-handler
+ (lambda ( . rest)
+ (apply collect-scores-for-book rest)))
+
+#(define toplevel-text-handler
+ (lambda ( . rest)
+ (apply collect-scores-for-book rest)))
+
+#(set! output-empty-score-list #t)