3 Months Free Music for 6 People on The Family Plan (Worth AUD$20.49 Per Month) @ Amazon Music

Note: This is for new subscriptions only
If you have had this previously then just sign up for a new account, invite your old account to be part of your family and you can maintain any old playlists you had created previously

The link will take you to the '3 months free' for Individual Plan - worth AUD $13.49 per month.
Once you click 'Try Now' and sign in you will be given the option for a free upgrade to the Family Plan (worth AUD $20.49 per month after the trial)
The Family Plan allows up to 6 users to share a plan each with their own music playlists.

This 3 months free trial offer of a monthly Amazon Music Unlimited Individual Plan or Family Plan is a limited time offer and expires at 09.00am (AEST) on 10 January 2022. The offer is valid for new customers to Amazon Music Unlimited and only redeemable towards the Amazon Music Unlimited Individual Monthly Plan or Family Plan upgrade.
After the promotional trial, your subscription will automatically renew at AUD 13.49 per month (individual) or AUD 20.49 (Family) until you cancel.

You can cancel at any time - suggest you do this straight away so as not to forget later. You will still get the full 3 months free
Go to Your Amazon Music Settings. https://www.amazon.com.au/music/settings
Go to the Amazon Music Unlimited section.
Select the Cancel option in your Subscription Renewal details.
Confirm the cancellation.