diff --git a/books/lyricbook.sb b/books/lyricbook.sb
index fea74e3e..4e2f8cb8 100644
--- a/books/lyricbook.sb
+++ b/books/lyricbook.sb
@@ -6,6 +6,7 @@
 "author" : "Crep (R.Goffe) \\and Lohrun (A.Dupas)",
 "subtitle" : "parolier",
 "title" : "Recueil de chansons",
+"content" : [["sorted"]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/lyricbook_en.sb b/books/lyricbook_en.sb
index 853d5e67..9a20fdff 100644
--- a/books/lyricbook_en.sb
+++ b/books/lyricbook_en.sb
@@ -5,6 +5,7 @@
 "booktype" : "lyric",
 "author" : "Crep (R.Goffe) \\and Lohrun (A.Dupas)",
 "subtitle" : "lyrics",
+"content" : [["sorted"]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/lyricbook_fr.sb b/books/lyricbook_fr.sb
index 871b1493..bfd0ce33 100644
--- a/books/lyricbook_fr.sb
+++ b/books/lyricbook_fr.sb
@@ -5,6 +5,7 @@
 "booktype" : "lyric",
 "author" : "Crep (R.Goffe) \\and Lohrun (A.Dupas)",
 "subtitle" : "parolier",
+"content" : [["sorted"]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/naheulbeuk.sb b/books/naheulbeuk.sb
index f27f33ff..131135c2 100644
--- a/books/naheulbeuk.sb
+++ b/books/naheulbeuk.sb
@@ -13,10 +13,10 @@
 "subtitle" : "Recueil de chansons non-officiel",
 "title" : "Le Donjon de Naheulbeuk",
 "version" : "0.5",
-"content" : [
+"content" : [["sorted",
     "belyscendre/*.sg",
     "le_donjon_de_naheulbeuk/*.sg"
-  ],
+  ]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/songbook.sb b/books/songbook.sb
index 9fce6fc6..3c2e569d 100644
--- a/books/songbook.sb
+++ b/books/songbook.sb
@@ -1,6 +1,7 @@
 {
 "template" : "data.tex",
 "lang" : "french",
+"content" : [["sorted"]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/songbook_en.sb b/books/songbook_en.sb
index 9c67e87d..75b82dd0 100644
--- a/books/songbook_en.sb
+++ b/books/songbook_en.sb
@@ -6,6 +6,7 @@
     "lilypond",
     "pictures"
   ],
+"content" : [["sorted"]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/songbook_fr.sb b/books/songbook_fr.sb
index 615db5f8..31adc694 100644
--- a/books/songbook_fr.sb
+++ b/books/songbook_fr.sb
@@ -6,6 +6,7 @@
     "lilypond",
     "pictures"
   ],
+"content" : [["sorted"]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/volume-1.sb b/books/volume-1.sb
index edac15d8..ae43dbbc 100644
--- a/books/volume-1.sb
+++ b/books/volume-1.sb
@@ -10,7 +10,7 @@
 "picture" : "feel-the-music",
 "picturecopyright" : "foxygamergirl @ deviantart.com",
 "subtitle" : "Tome 1",
-"content" : [
+"content" : [["sorted",
     "alain_bashung/gaby_oh_gaby.sg",
     "amy_macdonald/mr._rock_n_roll.sg",
     "amy_macdonald/this_is_the_life.sg",
@@ -181,7 +181,7 @@
     "yves_jamait/et_je_bois.sg",
     "yvon_etienne/chemise_rouge.sg",
     "yvon_etienne/y_a_des_nouilles_et_du_nougat.sg"
-  ],
+  ]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/volume-2.sb b/books/volume-2.sb
index 418c27df..1329a635 100644
--- a/books/volume-2.sb
+++ b/books/volume-2.sb
@@ -10,7 +10,7 @@
 "picture" : "sound",
 "picturecopyright" : "ellesh @ deviantart.com",
 "subtitle" : "Tome 2",
-"content" : [
+"content" : [["sorted",
     "aaron/u_turn_lili.sg",
     "alain_souchon/foule_sentimentale.sg",
     "alex_beaupain/je_n_aime_que_toi.sg",
@@ -188,7 +188,7 @@
     "yuki_kajiura/jr.sg",
     "yuki_kajiura/vanity.sg",
     "edith_piaf/l_homme_a_la_moto.sg"
-  ],
+  ]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/volume-3.sb b/books/volume-3.sb
index cc4e7696..efdfe670 100644
--- a/books/volume-3.sb
+++ b/books/volume-3.sb
@@ -10,7 +10,7 @@
 "picture" : "Mousey_Band_by_Duffzilla",
 "picturecopyright" : "duffzilla @ deviantart.com",
 "subtitle" : "Tome 3",
-"content" : [
+"content" : [["sorted",
     "alain_souchon/l_amour_a_la_machine.sg",
     "alanis_morissette/ironic.sg",
     "alex_beaupain/as_tu_deja_aime.sg",
@@ -176,7 +176,7 @@
     "traditionnel/l_homme_de_cromagnon.sg",
     "tri_yann/kiss_the_cildren_for_me_mary.sg",
     "tri_yann/les_filles_de_redon.sg"
-  ],
+  ]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/volume-4.sb b/books/volume-4.sb
index dd85bef9..1e18fce2 100644
--- a/books/volume-4.sb
+++ b/books/volume-4.sb
@@ -10,7 +10,7 @@
 "picture" : "music_by_lauratheartist",
 "picturecopyright" : "LauraTheArtist @ deviantart.com",
 "subtitle" : "Tome 4",
-"content" : [
+"content" : [["sorted",
     "alain_souchon/bidon.sg",
     "ben_e_king/stand_by_me.sg",
     "bill_withers/just_two_of_us.sg",
@@ -170,7 +170,8 @@
     "vincent_delerm/la_natation_synchronisee.sg",
     "william_balde/rayon_de_soleil.sg",
     "yves_duteil/le_petit_pont_de_bois.sg",
-    "yves_simon/les_bateaux_du_metro.sg"],
+    "yves_simon/les_bateaux_du_metro.sg"
+    ]],
 "authwords" : {
   "sep" : ["and", "et"]
   },
diff --git a/books/volume-5.sb b/books/volume-5.sb
index fae7f97e..c63bbf90 100644
--- a/books/volume-5.sb
+++ b/books/volume-5.sb
@@ -10,7 +10,7 @@
 "picture" : "The_Music_Machine_by_hit_squad",
 "picturecopyright" : "hit-squad @ deviantart.com",
 "subtitle" : "Tome 5",
-"content" : [
+"content" : [["sorted",
     "3_doors_down/here_without_you.sg",
     "adele/rolling_in_the_deep.sg",
     "alain_souchon/la_ballade_de_jim.sg",
@@ -191,7 +191,8 @@
     "yves_jamait/etc.sg",
     "yves_jamait/jean-louis.sg",
     "yves_simon/diabolo_menthe.sg",
-    "yves_simon/les_bateaux_du_metro.sg"],
+    "yves_simon/les_bateaux_du_metro.sg"
+    ]],
 "authwords" : {
   "sep" : ["and", "et"]
   },