diff --git a/src/Data/Chart.cpp b/src/Data/Chart.cpp
index 498bc1d..b167429 100644
--- a/src/Data/Chart.cpp
+++ b/src/Data/Chart.cpp
@@ -24,8 +24,12 @@ namespace Data {
         for (auto &&note : chart.notes) {
             auto timing = static_cast<std::size_t>(memon_timing_to_300Hz.transform(note.get_timing()));
             auto position = static_cast<Button>(note.get_pos());
-            auto length = static_cast<std::size_t>(memon_timing_to_300Hz_proportional.transform(note.get_length()));
-            auto tail = convert_memon_tail(position, note.get_tail_pos());
+            std::size_t length = 0;
+            Button tail = Button::B1;
+            if (note.get_length() != 0) {
+                length = static_cast<std::size_t>(memon_timing_to_300Hz_proportional.transform(note.get_length()));
+                auto tail = convert_memon_tail(position, note.get_tail_pos());
+            }
             notes.insert({timing, position, length, tail});
         }
     }
@@ -60,7 +64,7 @@ namespace Data {
         if (auto tail = coords_to_button({x+dx, y+dy})) {
             return *tail;
         } else {
-            throw std::runtime_error("Invalid tail_position : "+tail_position);
+            throw std::runtime_error("Invalid tail_position : "+std::to_string(tail_position));
         }
     }
 }
diff --git a/src/Data/Song.cpp b/src/Data/Song.cpp
index 61bdbdd..ae90905 100644
--- a/src/Data/Song.cpp
+++ b/src/Data/Song.cpp
@@ -82,7 +82,10 @@ namespace Data {
             [](const fs::directory_entry& de) {return de.path().extension() == ".memon";}
         );
         if (memon_path != fs::end(folder_memon)) {
-            res.push_back(std::make_shared<MemonSong>(memon_path->path()));
+            auto song = std::make_shared<MemonSong>(memon_path->path());
+            if (not song->chart_levels.empty()) {
+                res.push_back(song);
+            }
             return res;
         }
         // Nothing found : recurse in subfolders
diff --git a/src/Screens/MusicSelect/DensityGraph.cpp b/src/Screens/MusicSelect/DensityGraph.cpp
index 79a4069..7980bd3 100644
--- a/src/Screens/MusicSelect/DensityGraph.cpp
+++ b/src/Screens/MusicSelect/DensityGraph.cpp
@@ -5,6 +5,8 @@
 
 #include <SFML/Audio.hpp>
 
+#include "../../Toolkit/AffineTransform.hpp"
+
 namespace MusicSelect {
 
     DensityGraph::DensityGraph(const std::array<unsigned int, 115>& t_densities) :
@@ -12,22 +14,23 @@ namespace MusicSelect {
         m_vertex_array(sf::Quads, 0)
     {
         std::size_t column = 0;
+        sf::Vector2f origin{0.f, 39.f};
         for (auto &&density : m_densities) {
             for (size_t row = 0; row < static_cast<std::size_t>(density); row++) {
                 m_vertex_array.append(sf::Vertex(
-                    sf::Vector2f(column*5.0f, row*-5.0f),
+                    origin+sf::Vector2f(column*5.0f, row*-5.0f),
                     sf::Color::White
                 ));
                 m_vertex_array.append(sf::Vertex(
-                    sf::Vector2f(column*5.0f, row*-5.0f),
+                    origin+sf::Vector2f(column*5.0f-4.0f, row*-5.0f),
                     sf::Color::White
                 ));
                 m_vertex_array.append(sf::Vertex(
-                    sf::Vector2f(column*5.0f, row*-5.0f),
+                    origin+sf::Vector2f(column*5.0f-4.0, row*-5.0f-4.0f),
                     sf::Color::White
                 ));
                 m_vertex_array.append(sf::Vertex(
-                    sf::Vector2f(column*5.0f, row*-5.0f),
+                    origin+sf::Vector2f(column*5.0f, row*-5.0f-4.0f),
                     sf::Color::White
                 ));
             }
@@ -69,8 +72,14 @@ namespace MusicSelect {
     DensityGraph compute_density_graph_3(const Data::Chart& chart, long start, long end) {
         std::array<unsigned int, 115> d{};
         if (start != end) {
+            Toolkit::AffineTransform<float> ticks_to_column{
+                static_cast<float>(start),
+                static_cast<float>(end),
+                0.f,
+                115.f
+            };
             for (auto &&note : chart.notes) {
-                auto index = (note.timing-start)*115/(end-start);
+                auto index = static_cast<unsigned int>(ticks_to_column.transform(static_cast<float>(note.timing)));
                 d.at(index) += 1;
             }
             std::replace_if(
@@ -83,3 +92,10 @@ namespace MusicSelect {
         return DensityGraph{d};
     }
 }
+
+namespace Toolkit {
+    template<>
+    void set_origin_normalized(MusicSelect::DensityGraph& s, float x, float y) {
+        s.setOrigin(x*574.f, y*39.f);
+    }
+}
\ No newline at end of file
diff --git a/src/Screens/MusicSelect/DensityGraph.hpp b/src/Screens/MusicSelect/DensityGraph.hpp
index a0e6f6b..e957c6f 100644
--- a/src/Screens/MusicSelect/DensityGraph.hpp
+++ b/src/Screens/MusicSelect/DensityGraph.hpp
@@ -8,6 +8,7 @@
 #include "../../Data/Chart.hpp"
 #include "../../Data/Song.hpp"
 #include "../../Toolkit/Cache.hpp"
+#include "../../Toolkit/NormalizedOrigin.hpp"
 
 namespace MusicSelect {
     class DensityGraph : public sf::Drawable, public sf::Transformable {
@@ -47,4 +48,9 @@ namespace std {
             return song_hash;
         }
     };
+}
+
+namespace Toolkit {
+    template<>
+    void set_origin_normalized(MusicSelect::DensityGraph& s, float x, float y);
 }
\ No newline at end of file
diff --git a/src/Screens/MusicSelect/SongInfo.cpp b/src/Screens/MusicSelect/SongInfo.cpp
index 859887e..8c06aea 100644
--- a/src/Screens/MusicSelect/SongInfo.cpp
+++ b/src/Screens/MusicSelect/SongInfo.cpp
@@ -236,7 +236,9 @@ namespace MusicSelect {
         if (not densities.has_value()) {
             return;
         }
+        Toolkit::set_origin_normalized(*densities, 0.5f, 1.f);
         densities->setScale(get_screen_width()/768.f, get_screen_width()/768.f);
+        densities->setPosition(get_screen_width()*0.5f,423.f/768.f*get_screen_width());
         target.draw(*densities, states);
     }
 }