you can play your song now :D

src/ui/app.py

@@ -1,5 +1,6 @@
 from textual.app import App, ComposeResult
 from textual.widgets import Footer, Tab, Tabs, Header
+from textual import on, events
 
 from ui.widgets.sidebar import Sidebar
 from ui.widgets.timeline import Timeline, TimelineRow
@@ -12,13 +13,20 @@ from project import ProjectChannel
 class AppUI(App):    
     CSS_PATH = "../assets/style.tcss"
     
-    theme = "tokyo-night"
-    
     def __init__(self, project):
         super().__init__()
         self.zoom_level = 0.05
         self.last_zoom_level = self.zoom_level
         self.project = project
+        
+    @on(events.Key)
+    async def key_pressed(self, event: events.Key):
+        if event.key == "space":
+            timeline = self.query_one(Timeline)
+            if not timeline.song_player.paused:
+                timeline.song_player.pause()
+            else:
+                timeline.song_player.play_project(self.app.project)
     
     def create_channel(self, name: str):
         self.query_one("#channels").mount(Channel(