Before this page is included in the public guide directory, its examples are compared with the payload produced by the linked QRFlow generator and with the export and scan-readiness controls available in the current build. Camera, lighting, paper, print size, and destination apps can still change the result, so important print runs should always be tested on the final material and real devices.
A music QR code is just a QR code that opens a track, album, or playlist link. The key is using the official share link so it opens the exact destination reliably.
If you need one QR code that lets people choose between Spotify and Apple Music, create a simple link page with buttons using Link Page QR. If you plan to change the destination later, check Dynamic QR availability before printing.
Can you change a QR code destination after printing? Only with a hosted redirect link you control. Compare that path with a fixed static URL before you print.
Use 20-25 mm (0.8-1.0 in) for most business cards. Includes minimum size guidance for short URLs, larger sizing for vCards, quiet zone rules, and a card dimensions chart.