Write an article based on this "Go to https://www.facebook.com in your web browser. Click What’s on Your Mind. Click the emoji icon. Click the light bulb icon. Click the music note you want to insert."
If you’re not already signed in to your account, sign in now. It’s at the top of the news feed. If you’re responding to another post or comment, browse to that post, then click Write a comment. It’s the smiling face at the bottom-right corner of the typing area. It’s at the bottom of the emoji list (third icon from the right). You have two different options—a single note or three smaller ones. The music note now appears in the typing area.