Greetings reallypurple,
According to the resource you used to reach us, you need:
"Here’s what you need
- An Apple Music subscription. If you’re not a subscriber, you can join on your iPhone, iPad, or iPod touch, or on your Android device.
- An Amazon Echo, Amazon Fire TV, or Alexa-enabled Sonos speaker that you already set up with the Amazon Alexa app on your iOS or Android device.
The iOS or Android device that you already set up with Alexa. Make sure that you update to the latest iOS and check the App Store to see if there are updates for the Amazon Alexa app. If you use an Android device, check the Google Play Store for any updates to the Apple Music app or Amazon Alexa app." Play Apple Music with Alexa
So you would need an Apple Music subscription.
We hope this helps!
Sincerely.