Hello sarahndeed,
Welcome to the Apple Support Communities!
I understand that you have questions about Apple Music and music that is available offline. When you make a song, album, or playlist available for offline listening, it only means that you will have access to listen without being connected to the internet as described in the article below. You will not be charged for the music you make available for offline listening other than your Apple Music subscription service fee.
Add music from the Apple Music catalog to your library - Apple Support
You can save songs, albums, or playlists to listen to when you're not connected to the Internet.* You must save songs, albums, or playlists on each device that you want to use for offline listening.
On your iPhone, iPad, or iPod touch:
- In the Music app, find the item that you want to save.
- Tap the More Options icon
to the right of the song, album, or playlist name.
- Tap Make Available Offline.
Songs and albums appear under My Music > Library. Playlists appear under My Music > Playlists.
On your Mac or PC:
- In iTunes, find the item that you want to save in the My Music or Playlists tab. You can't save items to listen to offline from the iTunes Store.
- Click the cloud icon to the right of the song's name, on the album cover, or to the right of the playlist's name.
Songs and albums appear under the My Music tab. Playlists appear in the Playlists tab, under Apple Music Playlists in the sidebar.
You can view just songs, albums, playlists that you saved for offline listening:
- iPhone, iPad, iPod touch: In the My Music tab, tap Library. Then tap any of the different views (Artists, Albums, etc.), and enable Music Available Offline.
- Mac: In iTunes, from the menu bar at the top of your computer screen, choose View > Only Music Available Offline.
- Windows: Press Control + B on your keyboard to open the iTunes menu bar. Choose View > Only Music Available Offline.
*You can save music offline on up to 10 devices. These songs are accessible only during your Apple Music membership.
Have a great day