Hey there Enigma88,
Thanks for reaching out to the Apple Support Communities. We understand you have questions about using you Apple Music subscription abroad, and we'd be happy to help.
To get started, your Apple Music subscription can be used while traveling; however, if you need to change your Apple ID country or region for any reason you would need to cancel your Apple Music subscription. After you change your Apple ID country or region you may be able to resubscribe to Apple Music, but that would depend on if the country/region you're in supports Apple Music.
For more details on changing your Apple ID country/region, check out this link here: Change your Apple ID country or region - Apple Support
This next resource provides details on what content and services are available in each country: Availability of Apple Media Services - Apple Support
We hope that's able to help.
Take care!