Get what music?
Are you saying you are subscribed to iTunes Match? Or to Apple Music?
What music are you trying to get exactly?
iTunes Match and Apple Music, offer the option of matching or uploading songs in a music library on a computer to the iTunes Store or Apple Music service catalog.
If you had an existing library on a computer where you turned on the Sync Library option either in iTunes or Apple Music apps, then turning on the same option on the iPad (Settings ➜ Apps ➜ Music ➜ Sync Library)
click here ➜ Use Sync Library with your Apple Music subscription - Apple Support
Beyond that, if you are trying to access songs and albums you purchases from the iTunes Store, you don't need a subscription for that.
click here ➜ Redownload music from the iTunes Store on your iPhone or iPad - Apple Support
If you are referring to something else, then please clarify.