I have tried 3 or 4 different wifi adapters and didn’t need to install drivers with any of them in Pi Musicbox.
Looking at this page it was a simple case of having the wrong SSID. Have you double checked the connection name and password.
Have you tried the wifi dongle to make sure it’s actually working, either in a windows pc or if you have a spare SD card do a full install of Raspbian on it and try the Wifi dongle on that.
When the Pi has booted up is it showing up on your router as Musicbox.
Can you connect the Pi to your router via cable, then try and find it on your network, at least you will know it’s working and you can connect to it. You might then be able to figure out the wifi connection.