If you want to enjoy the songs offline, you need to download them beforehand. However, you can only play them when you are connected to the network. That’s to say, you can add music to iCloud Music Library from computer, iPhone, or iPad, then you can access all the uploaded songs whenever you are connected to the network. As long as you have subscribed to Apple Music or iTunes Match, you can access all your songs on all your devices. That’s iCloud Music Library, which can help us store up to 100,000 songs. Apple offers a convenient way to help us store our music collection.