diff --git a/src/bin/client.rs b/src/bin/client.rs
deleted file mode 100644
index 676042f..0000000
--- a/src/bin/client.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    rmp::client::run().unwrap();
-}
diff --git a/src/lib.rs b/src/lib.rs
deleted file mode 100644
index b9babe5..0000000
--- a/src/lib.rs
+++ /dev/null
@@ -1 +0,0 @@
-pub mod client;
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..da083c5
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,4 @@
+pub mod client;
+pub mod server;
+
+fn main() {}
diff --git a/src/server.rs b/src/server.rs
new file mode 100644
index 0000000..74e6db3
--- /dev/null
+++ b/src/server.rs
@@ -0,0 +1,5 @@
+pub mod audio_backend;
+
+pub fn run() -> Result<(), ()> {
+    Ok(())
+}
diff --git a/src/server/audio_backend.rs b/src/server/audio_backend.rs
new file mode 100644
index 0000000..95663ae
--- /dev/null
+++ b/src/server/audio_backend.rs
@@ -0,0 +1,7 @@
+use std::{path::Path, time::Duration};
+
+pub trait AudioBackend {
+    fn seek_and_play(&mut self, file_path: &Path, seek: Duration) -> ();
+    fn pause_playback(&mut self) -> ();
+    fn continue_playback(&mut self) -> ();
+}