If it is a birthday e-card, it depends on the specific situation. Generally, if you don’t want to use the happy birthday song, you can use "happy". If the scene you set is very warm, choose a song or music with a slow melody, even if it is usually It doesn't sound very emotional, but as long as you are in that environment, it will be very touching. If it is other greeting cards, it also depends on the situation. If you choose dynamic songs or music in a lively scene, you usually choose Korean songs or "Forward". As long as you put your mind to it, you will achieve results. Greeting cards are just emotional sustenance. I wish you happiness!