* change can_delete to can_cancel, and don't cehck for start_at anymore

ruby/lib/jam_ruby/models/music_session.rb

@@ -392,8 +392,8 @@ module JamRuby
       active_music_session && active_music_session.mount
     end
 
-    def can_delete? user
-      self.creator == user && self.started_at.nil?
+    def can_cancel?  user
+      self.creator == user
     end
 
     def legal_policy_url

web/app/controllers/api_music_sessions_controller.rb

@@ -240,7 +240,7 @@ class ApiMusicSessionsController < ApiController
   def destroy
     begin
       music_session = MusicSession.find(params[:id])
-      if music_session.can_delete? current_user
+      if music_session.can_cancel? current_user
         Notification.send_scheduled_session_cancelled music_session
         music_session.canceled = true
         music_session.save