My Apple Music subscription

Question

Telstra customers can access their subscription information from My Account: 
What do I do if I forget my Apple ID or password & cannot login or access Apple Music?
Your Apple Music login is the same as your Apple ID. You can retrieve this here: https://iforgot.apple.com/appleid
You can reset your password here: https://iforgot.apple.com/password/verify/appleid?language=GB-EN 
If you are still having issues, please contact AppleCare on http://getsupport.apple.com
How do I cancel my Apple Music subscription?
You can cancel your Apple Music subscription at any time within My Account:
How does it work if I cancel my subscription halfway through the month?
Customers who are on a paid subscription with Telstra will have the subscription cancelled immediately and the remaining billed period refunded on to their mobile account.
Customers who are in a trial or promotional period will be cancelled immediately.
I cancelled my account, but realised I want it back! How do I do that?
You can resume your Apple Music subscription within My Account:
Click on your mobile account in My Account, then click the ‘add’ button next to Apple Music.
Time spent in a cancelled state will count towards your trial period.

Answer 1

The problem is that all services are bundled with your Apple ID ([email protected]):
Your iCloud account (Mail, Contacts, Calendars, Reminders, Notes, Backups, etc.),
also iTunes & App Store purchases (Music, Movies, TV Shows, etc.),
and the iTunes Match services.
(I guess that all your devices - yours and your wife's are connected to one iTunes library, right?)
If you want that your wife gets her own iCloud account for Mail, Contacts, Calendars, etc. but gets also access to your media then you have two set up two things on her device:
iCloud (Settings > iCloud) with her account (e.g. [email protected])
and
iTunes & App Stores (Settings > iTunes & App Stores) with your account (e.g. [email protected]).
In this case she gets access to your library and could use the same iTunes Match account.
(See also: Using one Apple ID for iCloud and a different Apple ID for Store Purchases http://support.apple.com/kb/HT4895)