Question: Is there an app that generates soundtracks for books, so I can listen to music that matches the story's mood?

If you're looking for an app to create soundtracks for books, Muzify is a good choice. This AI-powered service creates playlists of music based on books, an approach that can help you get more out of a book by matching its tone and mood. You can search and browse a big library of books, pick different books or authors, and customize the playlists on Spotify to get the sound you want.

Another interesting project is Muzaic. Although it's geared primarily for creating soundtracks for videos, presentations and games, you could use its ability to create music with a variety of parameters like intensity and tempo to match the mood of a book. Muzaic generates high-quality music and lets you adjust it in real time, so it's a good tool for customizing audio content.

If you're interested in AI music for multimedia projects, Mubert has a variety of tools and services, including AI soundtracks in different styles and moods. It's particularly useful for content creators and developers looking for royalty-free music. Mubert's API lets you build it into your own apps, and it's got a big library of high-quality audio assets.