diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5792bc..7091b0b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,23 +5,22 @@ project(project-kyoku LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
-set(SOURCES application.cpp note.cpp debughelper.cpp main.cpp timeline.cpp timelineviews/timelineviewmanager.cpp timelineviews/classicviewmanager.cpp)
-set(HEADER_FILES application.h note.h debughelper.h timeline.h timelineviews/timelineviewmanager.h timelineviews/classicviewmanager.h)
+file(GLOB SOURCES "*.h" "*.cpp" "*/*.h" "*/*.cpp")
 
 # STATIC #
 # You need to build SFML from sources with cmake
-set(SFML_LIB_DIR
-    ${CMAKE_SOURCE_DIR}/SFML-2.5.1/lib/libsfml-graphics.so.2.5
-    ${CMAKE_SOURCE_DIR}/SFML-2.5.1/lib/libsfml-system.so.2.5
-    ${CMAKE_SOURCE_DIR}/SFML-2.5.1/lib/libsfml-window.so.2.5
-    ${CMAKE_SOURCE_DIR}/SFML-2.5.1/lib/libsfml-audio.so.2.5)
-set(SFML_INCL_DIR ${CMAKE_SOURCE_DIR}/SFML-2.5.1/include)
-include_directories(${SFML_INCL_DIR})
-add_executable(project-kyoku ${SOURCES} ${HEADER_FILES} )
-target_link_libraries(project-kyoku ${SFML_LIB_DIR})
+#set(SFML_LIB_DIR
+#    ${CMAKE_SOURCE_DIR}/SFML-2.5.1/lib/libsfml-graphics.so.2.5
+#    ${CMAKE_SOURCE_DIR}/SFML-2.5.1/lib/libsfml-system.so.2.5
+#    ${CMAKE_SOURCE_DIR}/SFML-2.5.1/lib/libsfml-window.so.2.5
+#    ${CMAKE_SOURCE_DIR}/SFML-2.5.1/lib/libsfml-audio.so.2.5)
+#set(SFML_INCL_DIR ${CMAKE_SOURCE_DIR}/SFML-2.5.1/include)
+#include_directories(${SFML_INCL_DIR})
+#add_executable(project-kyoku ${SOURCES})
+#target_link_libraries(project-kyoku ${SFML_LIB_DIR})
 
 # DYNAMIC #
 # You only need to install SFML from your package manager
-#find_package(SFML REQUIRED graphics window system)
-#add_executable(project-kyoku ${SOURCES} ${HEADER_FILES} )
-#target_link_libraries(project-kyoku sfml-system sfml-audio sfml-graphics sfml-network)
+find_package(SFML REQUIRED graphics window system)
+add_executable(project-kyoku ${SOURCES})
+target_link_libraries(project-kyoku sfml-system sfml-audio sfml-graphics sfml-network)
diff --git a/application.cpp b/application.cpp
index e9c53a4..3916a4b 100644
--- a/application.cpp
+++ b/application.cpp
@@ -25,7 +25,7 @@ void Application::run()
 
     _music.openFromFile(song_filename);
     _music.play();
-    _music.setVolume(2);
+    _music.setVolume(30);
 
     _game_window.display();
 
diff --git a/notesprites/classicarrow.cpp b/notesprites/classicarrow.cpp
new file mode 100644
index 0000000..bbbc0c4
--- /dev/null
+++ b/notesprites/classicarrow.cpp
@@ -0,0 +1,12 @@
+#include "classicarrow.h"
+
+ClassicArrow::ClassicArrow()
+{}
+
+ClassicArrow::~ClassicArrow()
+{}
+
+void ClassicArrow::update()
+{
+
+}
diff --git a/notesprites/classicarrow.h b/notesprites/classicarrow.h
new file mode 100644
index 0000000..0d1573c
--- /dev/null
+++ b/notesprites/classicarrow.h
@@ -0,0 +1,27 @@
+#ifndef CLASSICARROW_H
+#define CLASSICARROW_H
+
+#include "notesprite.h"
+
+class ClassicArrow : public NoteSprite
+{
+public:
+
+    enum class Type
+    {
+        ARROW_UP,
+        ARROW_RIGHT,
+        ARROW_DOWN,
+        ARROW_LEFT
+    };
+
+    explicit ClassicArrow();
+    virtual ~ClassicArrow() override;
+
+    virtual void update() override;
+
+private:
+
+};
+
+#endif // CLASSICARROW_H
diff --git a/notesprites/notesprite.cpp b/notesprites/notesprite.cpp
new file mode 100644
index 0000000..50f2a2e
--- /dev/null
+++ b/notesprites/notesprite.cpp
@@ -0,0 +1,21 @@
+#include "notesprite.h"
+
+NoteSprite::NoteSprite() :
+    _state(State::DETACHED),
+    _attached(false)
+{}
+
+void NoteSprite::attach() noexcept
+{
+    _attached = true;
+}
+
+void NoteSprite::detach() noexcept
+{
+    _attached = false;
+}
+
+void NoteSprite::initState(State nextState) noexcept
+{
+    _state = nextState;
+}
diff --git a/notesprites/notesprite.h b/notesprites/notesprite.h
new file mode 100644
index 0000000..7102aae
--- /dev/null
+++ b/notesprites/notesprite.h
@@ -0,0 +1,36 @@
+#ifndef NOTESPRITE_H
+#define NOTESPRITE_H
+
+#include <SFML/Graphics/Drawable.hpp>
+#include <SFML/Graphics/Transformable.hpp>
+
+class NoteSprite : public sf::Drawable, public sf::Transformable
+{
+public:
+
+    enum class State
+    {
+        APPEARING,
+        ACTIVE,
+        TAPPED,
+        DYING,
+
+        DETACHED
+    };
+
+    explicit NoteSprite();
+    virtual ~NoteSprite() = 0;
+
+    virtual void update() = 0;
+
+    virtual void attach() noexcept final;
+    virtual void detach() noexcept final;
+
+    virtual void initState(State nextState) noexcept final;
+
+protected:
+    State _state;
+    bool _attached;
+};
+
+#endif // NOTESPRITE_H
diff --git a/timelineviews/classicviewmanager.cpp b/timelineviews/classicviewmanager.cpp
index 03bc5fa..177f468 100644
--- a/timelineviews/classicviewmanager.cpp
+++ b/timelineviews/classicviewmanager.cpp
@@ -52,7 +52,7 @@ std::shared_ptr<Sprite> ClassicViewManager::createSprite(Button kind_of_button)
 void ClassicViewManager::initNoteGraphics(Note *note)
 {
     const auto type = note->type();
-    for (const auto sprite : _sprite_dispatcher.at(static_cast<int>(type)))
+    for (const auto& sprite : _sprite_dispatcher.at(static_cast<int>(type)))
     {
         if (!sprite->isAttached())
         {
diff --git a/timelineviews/classicviewmanager.h b/timelineviews/classicviewmanager.h
index 2aa4ee1..4d9198f 100644
--- a/timelineviews/classicviewmanager.h
+++ b/timelineviews/classicviewmanager.h
@@ -20,10 +20,7 @@ private:
 
     enum Button
     {
-        ARROW_UP,
-        ARROW_RIGHT,
-        ARROW_DOWN,
-        ARROW_LEFT,
+
 
         SHOULDER_RIGHT,
         SHOULDER_LEFT,
diff --git a/timelineviews/timelineviewmanager.cpp b/timelineviews/timelineviewmanager.cpp
index 15593cb..5ea914e 100644
--- a/timelineviews/timelineviewmanager.cpp
+++ b/timelineviews/timelineviewmanager.cpp
@@ -2,6 +2,3 @@
 
 TimelineViewManager::TimelineViewManager()
 {}
-
-TimelineViewManager::~TimelineViewManager()
-{}
diff --git a/timelineviews/timelineviewmanager.h b/timelineviews/timelineviewmanager.h
index 59eb2e5..24d5815 100644
--- a/timelineviews/timelineviewmanager.h
+++ b/timelineviews/timelineviewmanager.h
@@ -7,7 +7,7 @@ class TimelineViewManager
 {
 public:
     explicit TimelineViewManager();
-    virtual ~TimelineViewManager();
+    virtual ~TimelineViewManager() = 0;
 
     virtual void initNoteGraphics(Note *note) = 0;
 };