macOS Catalina organizes your media from iTunes into three new apps:
Music: Listen to your favorite songs in the new Apple Music app. Your library contains all your music, and For You offers personalized playlists and suggestions. See Safari.
Security: Your Mac asks for permission before letting an app access your data or capture what’s happening on screen. All new apps are checked for security issues before you run them. Security improvements also make it harder for problems in one area to impact the rest of your Mac.