If you do not have an Apple Music Subscription: Now, your playlist will automatically appear on your iPhone. You can also check on your iPhone in Settings > Music to make sure Sync Library is turned on there as well as on your Mac. If you don't see that option, then you probably don't have an active Apple Music subscription. In Music on your Mac click the Music menu and select Settings > General, and there check Sync Library. There are two ways to do that: with an Apple Music subscription, or with a USB Cable. Now we need to move this playlist to your iPhone. You can turn this off if you don't find it helpful. Pro Tip: It is common for Apple Music to open automatically on your Mac. This playlist will always include all the music available for download. It doesn't matter how much music you have on the computer you use to create this playlist. And, because it's a playlist, you can tap the download icon at the top to download the whole thing. How it works: Because it's a Smart Playlist, your Apple Music playlist will automatically include every song you add in Apple Music and every song you purchase in iTunes that meet its criteria. Give the playlist a name I named mine All my Music!.Check Live updating so that new songs added to your Apple Music Library are downloaded too. Leave 00:00 in the time formatted box that way, all your songs will be included since they are all longer than zero seconds. The playlist will add songs based on their length (time) being longer than the value you set next. Select Time from the second drop-down box and is greater than in the second. The playlist will add songs that match the following rule. A box will pop up where you can set rules for how the Smart Playlist decides which songs to add.

At the very top, select File, choose New, and click Smart Playlist.

For this example, I'll use the Music app. You don't need to download all your music to this computer, but you can if you want.

Open the Music app on your Mac or iTunes on your Windows Computer.

I tunes download