I am consdiering signing up for Apple Music with some of the prices with albums on iTunes I think the $9.99 a month fee works out much cheaper than purchasing albums. My one query comes with the Offline Listening function. I know I can save songs/albums onto a device to listen without the need of WiFi or a Celluar connection. My question is how long can I keep offline files on my device. Say if I saved an album for offline listening how long would I be able to keep it on my device. I know with Spotify they have some sort of thing where you have to remove offline files after a certain period of time.