The reason music stops when opening Facebook is primarily because Facebook has an autoplay video feature that takes priority over background apps playing music. When Facebook videos autoplay, the app forces other audio sources, like your music app, to mute so Facebook's video sound can play. This happens regardless of whether you are playing Apple Music, Spotify, or other music services. To fix this issue, the most effective solution is to disable the autoplay videos feature within Facebook's settings. On mobile, you can go to Facebook's menu, then Settings & Privacy > Settings > Media, and select "Never Autoplay Videos." On desktop, you go to Settings > Media and toggle off autoplay videos. Additionally, turning off Facebook's in-app sound or camera access in your phone settings can help prevent Facebook from interrupting your music. If these steps don't work, closing other apps to free up resources, updating or reinstalling Facebook, or restarting your device may also help. In summary, Facebook's autoplay videos override your music app's audio, but turning off autoplay and adjusting some app permissions can allow your music to continue uninterrupted while browsing Facebook.