Well, first, make sure your app is updated. Then, when creating your story, you'll find a music icon. Click on it and browse through the available Reels music. Select the one that suits your story best. You might also be able to adjust the start and end points of the music to fit your needs.
You need to pick the right kind of reel music that matches the mood and theme of your story. For example, if it's a romantic story, go for soft and gentle music.
It's hard to give an exact number because new Shazam comics are constantly being produced. But there are a significant amount available over the years.
The age of Shazam in the comics is fluid. It can range from being presented as a youthful and inexperienced hero to having a slightly more mature presence depending on the plot and creative direction of the comic series.
They can use tempo. A slow tempo can be like a narrator taking their time to set the scene, perhaps for a peaceful village or a character's inner thoughts. A medium tempo could be for normal events in the story, like people going about their daily lives. A very fast tempo can represent chaos or a sudden turn of events. Additionally, the use of pauses in the music can be like a storyteller pausing for effect. It can build suspense or give the listener time to absorb what has just happened in the musical story.
In some fanfictions, Naruto might use music as a weapon by imbuing it with chakra. He could create powerful sound waves that can either stun opponents or disrupt their attacks. For example, he might play a tune on a flute and the vibrations of the music carry his chakra in a focused way, like a sonic blast.