There are 6 songs that cannot be obtained from the boxes. When you enter the links I gave with your mobile devices, you can have these songs for free. Enjoy!
1. The Touch - Stan Bush - Normal Song -
Link
2. Brawl Stars Theme - Supercell - Hard Song -
Link
3. Clash Royale Theme - Supercell - Hard Song -
Link
4. Hay Day Theme - Supercell - Hard Song -
Link
5. Clash of Clans Theme - Supercell - Extreme Song -
Link
6. The Fast Lane: Space Ape Edition - Harry Shotta - Extreme Song -
Link