CallerBuddy is a Progressive Web App by Vance Morrison (GitHub: vancem) for square dance callers. Manage a collection of music (MP3) and lyrics (HTML/Markdown), build playlists for a dance, and play songs with independent pitch and tempo control while reading lyrics on-screen.
Source: github.com/vancem/CallerBuddy. App: vancem.github.io/CallerBuddy.