diff --git a/assets/audio/music/level1/battle.ogg b/assets/audio/music/level1/battle.ogg
new file mode 100644
index 0000000..0984bb9
Binary files /dev/null and b/assets/audio/music/level1/battle.ogg differ
diff --git a/assets/audio/music/level1/choral.ogg b/assets/audio/music/level1/choral.ogg
new file mode 100644
index 0000000..eea732b
Binary files /dev/null and b/assets/audio/music/level1/choral.ogg differ
diff --git a/lib/audio.lua b/lib/audio.lua
index fcd40f3..226ba30 100644
--- a/lib/audio.lua
+++ b/lib/audio.lua
@@ -1,18 +1,87 @@
+local ease = require "lib.utils.easing"
+local AnimationNode = require "lib.animation_node"
+
 --- @class Audio
 --- @field musicVolume number
 --- @field soundVolume number
 audio = {}
 audio.__index = audio
 
-local function new(musicVolume, soundVolume) -- здесь мы должны выгружать значения из файлика с сохранением настроек
+--- здесь мы должны выгружать значения из файлика с сохранением настроек
+local function new(musicVolume, soundVolume)
     return setmetatable({
         musicVolume = musicVolume,
         soundVolume = soundVolume
     }, audio)
 end
 
-function audio:crossfade()
 
+--- if from is nil, than we have fade in to;
+--- if to is nil, than we have fade out from
+---
+--- also we should guarantee, that from and to have the same volume
+--- @param from love.Source
+--- @param to love.Source
+--- @param ms? number in milliseconds
+function audio:crossfade(from, to, ms)
+    to:setVolume(0)
+    to:play()
+    local fromVol = from:getVolume() or self.musicVolume
+    local toVol = to:getVolume() or self.musicVolume
+    local dt = love.timer.getDelta() * (ms or 1000)
+
+    while fromVol > 0 and toVol < self.musicVolume do
+        print(fromVol, toVol)
+        fromVol = self.musicVolume - fromVol + dt / self.musicVolume
+        from:setVolume(ease.easeOutQuad(fromVol))
+        toVol = toVol + dt / self.musicVolume
+        to:setVolume(ease.easeInQuad(toVol))
+        print(fromVol, toVol)
+    end
+end
+
+--- if from is nil, than we have fade in to;
+--- if to is nil, than we have fade out from
+---
+--- also we should guarantee, that from and to have the same volume
+--- @param from love.Source
+--- @param to love.Source
+--- @param ms? number in milliseconds
+function audio:crossfadeAnim(from, to, ms)
+    to:setVolume(0)
+    to:play()
+    print(from:getVolume(), to:getVolume())
+    local t = 0
+    local anim = AnimationNode {
+        function(node)
+            from:setVolume(self.musicVolume - node:getValue() * self.musicVolume)
+            to:setVolume(node:getValue() * self.musicVolume)
+            t = node.t
+            print(node.finished, node.duration, node.t)
+        end,
+        onEnd = function()
+            from:setVolume(0)
+            to:setVolume(self.musicVolume)
+        end,
+        duration = ms or 1000,
+        easing = ease.linear,
+        -- children = {
+        --     AnimationNode {
+        --         function(node)
+        --             from:setVolume(self.musicVolume - node:getValue() * self.musicVolume)
+        --         end
+        --     },
+        --     AnimationNode {
+        --         function(node)
+        --             to:setVolume(node:getValue() * self.musicVolume)
+        --             print(node.count)
+        --         end
+        --     }
+        -- }
+    }
+    anim:run()
+    anim:finish()
+    print(from:getVolume(), to:getVolume(), t, t, t)
 end
 
 --- @param source love.Source
diff --git a/lib/level/level.lua b/lib/level/level.lua
index 8dd3d33..8a1113a 100644
--- a/lib/level/level.lua
+++ b/lib/level/level.lua
@@ -18,6 +18,9 @@ local path = nil
 local function new(type, template)
     local size = Vec3 { 30, 30 } -- magic numbers for testing purposes only
     print(type, template, size)
+
+    Tree.audio:play(Tree.assets.files.audio.music.level1.battle)
+
     return setmetatable({
         size = size,
         characters = {},
diff --git a/lib/spellbook.lua b/lib/spellbook.lua
index b74ed7e..e21bc58 100644
--- a/lib/spellbook.lua
+++ b/lib/spellbook.lua
@@ -88,7 +88,10 @@ function regenerateMana:cast(caster, target)
     if not sprite then return true end
     AnimationNode {
         function(node)
+            local audioPath = Tree.assets.files.audio
             sprite:animate("hurt", node)
+            Tree.audio:crossfadeAnim(audioPath.music.level1.battle,
+                audioPath.music.level1.choral, 3000)
         end,
         onEnd = function() caster:has(Tree.behaviors.spellcaster):endCast() end
     }:run()
@@ -143,9 +146,10 @@ function attack:cast(caster, target)
                 children = {
                     AnimationNode {
                         function(node)
+                            local audioPath = Tree.assets.files.audio
                             targetSprite:animate("hurt", node)
                             -- Tree.assets.files.audio.sounds.hurt:play()
-                            Tree.audio:play(Tree.assets.files.audio.sounds.hurt)
+                            Tree.audio:play(audioPath.sounds.hurt)
                         end
                     }
                 }
diff --git a/lib/tree.lua b/lib/tree.lua
index 7973069..e22374f 100644
--- a/lib/tree.lua
+++ b/lib/tree.lua
@@ -8,6 +8,7 @@ Tree           = {
 }
 Tree.panning   = require "lib/panning"
 Tree.controls  = require "lib.controls"
+Tree.audio     = (require "lib.audio").new(1, 1)
 Tree.level     = (require "lib.level.level").new("procedural", "flower_plains")   -- для теста у нас только один уровень, который сразу же загружен
 
 Tree.behaviors = (require "lib.utils.behavior_loader")("lib/character/behaviors") --- @todo написать нормальную загрузку поведений