Use the Cresendo app to stitch individual video clips together to create one video story for sending and sharing. Great for birthdays, celebrations or causes. Create Video Stories With Friends in Just a Few Clicks. 1. Record. Start a Cresendo by recording a video message and sending it to your friends. 2. Contribute. Each invited person contributes their own video message. 3. Cresendo! Videos are automatically stitched into one story ready for sharing. Use Cresendo to: - Celebrate a Birthday Cresendo is perfect to bring people’s voices together in celebration when you can’t get together in person. - Boost a Cause Build a movement and raise funds. A combined video story is more powerful and will reach more people than doing it alone.