Lyrica is a PWA that lets you find song lyrics quickly. After you install Lyrica, you can share songs into it directly from your music app (if your device supports Web Share Target).
This web app was made as part of Netlify's dusty.domains challenge and helped raise $500 for charity.
As an additional challenge, I decided to create this entire thing in vanilla HTML/CSS/JS without even a build tool (unless netlify dev counts).