Every now and then Google will extend their typical 3 months free access to their Google Play Music Unlimited/ YouTube Red combo. Right now you can sign up for the combined service and get 4 months of free access.
Of course, there are the normal conditions, this offer is only available o those who are subscribing for the first time, and you’ll need to set up billing for the service for after your free trial. After the trial, the price will be $11.99 AUD/ month for a single user and $17.99 per month for a family plan with up to 6 users.
Being an Unlimited/ YouTube Red subscriber I can attest to how awesome it is to be able to just listen to any music on the Google Play catalogue, as well as the ad free experience in YouTube. IF you haven’t given it a trial yet give it a go.