PaperMC/nms-patches/BlockNote.patch

--- a/net/minecraft/server/BlockNote.java
+++ b/net/minecraft/server/BlockNote.java
@@ -27,7 +27,8 @@
 
         if (flag1 != (Boolean) iblockdata.get(BlockNote.POWERED)) {
             if (flag1) {
-                this.play(world, blockposition);
+                this.play(world, blockposition, iblockdata); // CraftBukkit
+                iblockdata = world.getType(blockposition); // CraftBukkit - SPIGOT-5617: update in case changed in event
             }
 
             world.setTypeAndData(blockposition, (IBlockData) iblockdata.set(BlockNote.POWERED, flag1), 3);
@@ -35,9 +36,14 @@
 
     }
 
-    private void play(World world, BlockPosition blockposition) {
+    private void play(World world, BlockPosition blockposition, IBlockData data) { // CraftBukkit
         if (world.getType(blockposition.up()).isAir()) {
-            world.playBlockAction(blockposition, this, 0, 0);
+            // CraftBukkit start
+            org.bukkit.event.block.NotePlayEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callNotePlayEvent(world, blockposition, data.get(BlockNote.INSTRUMENT), data.get(BlockNote.NOTE));
+            if (!event.isCancelled()) {
+                world.playBlockAction(blockposition, this, 0, 0);
+            }
+            // CraftBukkit end
         }
 
     }
@@ -49,7 +55,7 @@
         } else {
             iblockdata = (IBlockData) iblockdata.a((IBlockState) BlockNote.NOTE);
             world.setTypeAndData(blockposition, iblockdata, 3);
-            this.play(world, blockposition);
+            this.play(world, blockposition, iblockdata); // CraftBukkit
             entityhuman.a(StatisticList.TUNE_NOTEBLOCK);
             return EnumInteractionResult.SUCCESS;
         }
@@ -58,7 +64,7 @@
     @Override
     public void attack(IBlockData iblockdata, World world, BlockPosition blockposition, EntityHuman entityhuman) {
         if (!world.isClientSide) {
-            this.play(world, blockposition);
+            this.play(world, blockposition, iblockdata); // CraftBukkit
             entityhuman.a(StatisticList.PLAY_NOTEBLOCK);
         }
     }