diff --git a/backend/src/app.py b/backend/src/app.py
index 75a8ca7..3ce975b 100644
--- a/backend/src/app.py
+++ b/backend/src/app.py
@@ -1,7 +1,9 @@
 import dotenv
+from connect import get_connection
 from flask import Flask, Response, jsonify, request
 from flask_cors import CORS
 from flask_socketio import SocketIO, emit
+from state import State
 
 from .room import Room
 from .song import Song, init_db, get_song_by_title_artist, add_song_in_db
@@ -15,8 +17,9 @@ app.config["SECRET_KEY"] = "your_secret_key"
 socketio = SocketIO(app)
 CORS(app)
 
-
-ROOMS: dict[int, Room] = {}  # { room_id: room, ... }
+db_conn = get_connection()
+state = State(app, db_conn.cursor())
+init_db(state.db)
 
 
 def error(msg: str, status: int = 400) -> Response:
@@ -33,7 +36,7 @@ def join():
     if room_id is None:
         return error("Missing room id")
 
-    if (room := ROOMS.get(int(room_id))) is None:
+    if (room := state.rooms.get(int(room_id))) is None:
         return error("Invalid room")
 
     if room.pin is not None and room.pin != code:
@@ -47,7 +50,7 @@ def queue():
     if (room_id := request.args.get("room")) is None:
         return error("Missing room id")
 
-    if (room := ROOMS.get(int(room_id))) is None:
+    if (room := state.rooms.get(int(room_id))) is None:
         return error("Invalid room")
 
     return {"success": True, "queue": room.playing}
@@ -58,7 +61,7 @@ def queue_next():
     if (room_id := request.args.get("room")) is None:
         return error("Missing room id")
 
-    if (room := ROOMS.get(int(room_id))) is None:
+    if (room := state.rooms.get(int(room_id))) is None:
         return error("Invalid room")
 
     room.playing_idx += 1
@@ -90,7 +93,7 @@ def room_new():
     lat, lon = room_cords.split(",")
 
     room = Room(
-        id=max(ROOMS or [0]) + 1,  #
+        id=max(state.rooms or [0]) + 1,  #
         coord=(float(lat), float(lon)),
         name=room_name,
         pin=room_pin,
@@ -101,7 +104,7 @@ def room_new():
         playing_idx=-1,
     )
 
-    ROOMS[room.id] = room
+    state.rooms[room.id] = room
 
     return {"success": True, "room_id": room.id}
 
@@ -115,7 +118,7 @@ def room():
             "private": room.pin is not None,
             "coords": room.coord,
         }
-        for room in ROOMS.values()
+        for room in state.rooms.values()
     ]
 
 
@@ -124,7 +127,7 @@ def add_song():
     if (room_id := request.args.get("room")) is None:
         return error("Missing room id")
 
-    if (room := ROOMS.get(int(room_id))) is None:
+    if (room := state.rooms.get(int(room_id))) is None:
         return error("Invalid room")
 
     if (query := request.args.get("query")) is None:
@@ -135,7 +138,7 @@ def add_song():
     if (song := get_song_by_title_artist(info.title, info.artist)) is None:
         res = download_song_mp3(info.title, info.artist)
         if res is None:
-            ops
+            return error("Cannot get info from YT")
         yt_id, _ = res
         ## song not found, downolad from YT
         ## add in DB
diff --git a/backend/src/connect.py b/backend/src/connect.py
index 7bc991f..c07af1b 100644
--- a/backend/src/connect.py
+++ b/backend/src/connect.py
@@ -4,4 +4,5 @@ import sqlite3
 def get_connection():
     conn = sqlite3.connect(".data/jukebox.db")
     conn.row_factory = sqlite3.Row
+    conn.autocommit = True
     return conn
diff --git a/backend/src/room.py b/backend/src/room.py
index 7fc051d..bee8b7f 100644
--- a/backend/src/room.py
+++ b/backend/src/room.py
@@ -9,6 +9,7 @@ TAG_WEIGHT = 0.1
 RANDOM_WEIGHT = 0.1
 RECENT_PENALTY = 0.5
 RECENT_COUNT = 10
+QUEUE_SIZE = 3
 
 
 type UserScoredSong = tuple[Song, int]
@@ -34,11 +35,26 @@ class Room:
     pin: int | None
     tags: set[str]
 
-    songs: dict[str, UserScoredSong]  # canzoni + voto
-    history: list[Song]  # canzoni riprodotte (in ordine)
-    playing: list[Song]  # canzoni che sono i riproduzione
+    songs: dict[str, UserScoredSong]  # all songs + user score (the playlist)
+    history: list[Song]  # all songs previously played
+
+    playing: list[Song]  # queue
     playing_idx: int
 
+    def renew_queue(self):
+        for song in self.playing:
+            self.history.append(song)
+        self.playing.clear()
+        self.playing_idx = 0
+
+        rankings: dict[str, float] = {}
+        for id, (song, user_score) in self.songs.items():
+            rankings[id] = self.rank_song(song, user_score).total()
+
+        # sort dict items by their values and pick the highest 3
+        top_items = sorted(rankings.items(), key=lambda item: item[1], reverse=True)[:QUEUE_SIZE]  # [:3]
+        self.playing = list(map(lambda x: self.songs[x[0]][0], top_items))  # remove the ranking and take only the songs
+
     def rank_song_from_id(self, id: str) -> Rank:
         scored = self.songs[id]
         return self.rank_song(scored[0], scored[1])
@@ -109,18 +125,18 @@ def test_algo():
         None,
         set(["rock", "rap"]),
         {
-            "paulham": (songs[0], 2),
-            "cisco": (songs[1], 1),
-            "vpn": (songs[2], 5),
-            "gang": (songs[3], 1),
-            "bertha1": (songs[4], 1),
-            "bertha2": (songs[5], 1),
-            "bertha3": (songs[6], 1),
-            "cexx": (songs[7], -123123),
+            "paulham": (songs[0], 7),
+            "cisco": (songs[1], 5),
+            "vpn": (songs[2], 11),
+            "gang": (songs[3], 10),
+            "bertha1": (songs[4], 4),
+            "bertha2": (songs[5], 5),
+            "bertha3": (songs[6], -4),
+            "cexx": (songs[7], 12),
         },
-        [songs[4], songs[5], songs[0]],
+        [],
+        [songs[2], songs[0], songs[1]],
+        1,
     )
-
-    print(room.rank_song_from_id("paulham"), room.rank_song_from_id("paulham").total())
-    print(room.rank_song_from_id("vpn"), room.rank_song_from_id("vpn").total())
-    print(room.rank_song_from_id("cexx"), room.rank_song_from_id("cexx").total())
+    room.renew_queue()
+    print(room.playing)
diff --git a/backend/src/song.py b/backend/src/song.py
index 1d82b93..31cdec6 100644
--- a/backend/src/song.py
+++ b/backend/src/song.py
@@ -1,12 +1,12 @@
 from dataclasses import dataclass
 import uuid
+from sqlite3 import Cursor
+
 from .connect import get_connection
 
 
-def init_db():
-    conn = get_connection()
-    cursor = conn.cursor()
-    cursor.execute("""
+def init_db(db: Cursor):
+    db.execute("""
         CREATE TABLE IF NOT EXISTS songs (
             mbid TEXT PRIMARY KEY,
             title TEXT NOT NULL,
@@ -16,11 +16,9 @@ def init_db():
             youtube_id TEXT NOT NULL
         );
     """)
-    conn.commit()
-    conn.close()
 
 
-@dataclass
+@dataclass(frozen=True)
 class Song:
     mbid: str
     title: str
@@ -44,6 +42,20 @@ def get_song_by_mbid(mbid: str) -> Song | None:
     return song
 
 
+def get_song_by_title_artist(title: str, artist: str) -> Song | None:
+    conn = get_connection()
+    cursor = conn.cursor()
+    cursor.execute("SELECT * FROM songs WHERE title = ? AND artist = ?", (title, artist))
+    row = cursor.fetchone()
+    conn.close()
+
+    if row is None:
+        return None
+
+    song = Song(mbid=row["mbid"], title=row["title"], artist=row["artist"], tags=row["tags"].split(","), image_id=row["lastfm_image_id"], youtube_id=row["youtube_id"])
+    return song
+
+
 def add_song_in_db(title: str, artist: str, tags: list[str], image_id: str, yt_id: str) -> None:
     conn = get_connection()
     cursor = conn.cursor()
diff --git a/backend/src/state.py b/backend/src/state.py
new file mode 100644
index 0000000..7778117
--- /dev/null
+++ b/backend/src/state.py
@@ -0,0 +1,13 @@
+from dataclasses import dataclass
+from sqlite3 import Cursor
+
+from flask import Flask
+
+from .room import Room
+
+
+@dataclass
+class State:
+    app: Flask
+    db: Cursor
+    rooms: dict[int, Room] = {}  # { room_id: room, ... }