Task: Build a single-page app using ReactJS that serves as a song search engine, interacting with the iTunes API. The app should have the following features:
- Initial Page:
- Display a centered search bar at the top of the screen.
- Implement a search button that initiates the search once clicked.
- Search Results Page:
- Upon clicking the search button, navigate to a new page or component.
- Display a list of cards containing song information (title, artist, and album).
- Each card should also include an image of the album cover or track.
- The list should be scrollable if there are more results than can fit on the screen.
- Implement a back button to return to the initial search page.