You don't see a list of music in iCloud.
Go to iCloud make sure iCloud back up is on Then backup now over your wifi.
When you charge an iphone / ipad it automatically backs up to iCloud Over your wifi
If you need to restore iPhone or buy a new iPhone Then you set back up over your wifi
When it asks if you want to use iCloud backup Say yes to get your apps and data back.
Make sure you have enough space on iCloud go to manage storeage you can get
50G for £0.79 per month in UK if you live in another country just convert this.