diff --git a/Cargo.lock b/Cargo.lock
index f26cc09..f9f0cb2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1772,6 +1772,7 @@ dependencies = [
  "home",
  "ordered-float",
  "rodio",
+ "thiserror",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 61dca13..9778afe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,3 +14,4 @@ flate2 = {version = "1.0.25"}
 gd_plist = {git = "https://github.com/Syudagye/gd-plist.git", version = "1.4.0"}
 chrono = {version = "0.4.23"}
 ordered-float = {version = "3.4.0"}
+thiserror = {version = "1.0.38"}
diff --git a/src/gd.rs b/src/gd.rs
index 54ec6a2..e77b7e6 100644
--- a/src/gd.rs
+++ b/src/gd.rs
@@ -12,7 +12,7 @@ struct User {
     id: Option<u64>,
 }
 
-enum Song {
+pub enum Song {
     Official { id: i32 /*k8*/ },
     Newgrounds { id: i32 /*k45*/ },
     Unknown,
diff --git a/src/main.rs b/src/main.rs
index f3ba112..5570b49 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,6 +5,8 @@ use eframe;
 use eframe::egui;
 use std::boxed::Box;
 use std::collections::VecDeque;
+use std::fs::File;
+use thiserror::Error;
 
 struct PipeDash {
     msg_queue: VecDeque<Message>,
@@ -47,7 +49,18 @@ struct GdlData {
 
 struct Song {
     name: String,
-    id: u32,
+    id: i32,
+    decoder: rodio::Decoder<File>,
+}
+
+#[derive(Error, Debug)]
+enum SongError {
+    #[error("Unknown song")]
+    Unknown,
+    #[error("Official level song")]
+    Official,
+    #[error("Song mp3 not downloaded")]
+    MissingFile,
 }
 
 struct BeatRateWidget<'a> {
@@ -84,6 +97,28 @@ impl From<Color> for eframe::epaint::Color32 {
     }
 }
 
+impl Song {
+    pub fn try_new(gd_song: gd::Song) -> Result<Self, SongError> {
+        match gd_song {
+            gd::Song::Official { id: _ } => Err(SongError::Official),
+            gd::Song::Unknown => Err(SongError::Unknown),
+            gd::Song::Newgrounds { id } => {
+                let file_result = {
+                    let mut path = gd::gd_path();
+                    path.push(format!("{}.mp3", id));
+                    File::open(path)
+                };
+                match file_result {
+                    Ok(file) => {
+                        Ok(Song { name: unimplemented!(), id, decoder: unimplemented!() })
+                    }
+                    Err(err) => Err(SongError::MissingFile)
+                }
+            }
+        }
+    }
+}
+
 impl Editor {
     pub fn beat_rate_widget(&mut self) -> BeatRateWidget {
         BeatRateWidget {