The crank organ microcontroller has a small web server inside. You select tunes and configure the crank organ software with a browser on a PC or cell phone over WiFi to the microcontroller.
Press the Tune list (Lista de melodías, Melodieliste) and select some tunes.
Bear in mind that you can also play music on the crank organ software without any cell phone nor using these pages: Just tap the touch button, and/or turn the crank, and the music will play. No further technology needed.
This page does not store any information on the internet nor does it send any information to a server.
For detailed description see my Github repository here.