If you’re an Amazon Prime member who hasn’t tried Amazon Music Unlimited yet, Amazon is currently offering a pretty straightforward way to get four months of the premium music service for free.

The promotion gives eligible Prime members four months of Amazon Music Unlimited at no cost. That gets you unlimited, ad-free access to Amazon’s catalog, including more than 100 million songs, with support for HD, Ultra HD, Dolby Atmos, and 360 Reality Audio where available.

The important catch is eligibility: the four-month offer is specifically for Prime members who haven’t previously tried Amazon Music Unlimited. If you’ve already had an Unlimited subscription, the promotion may not be available to you.

And Amazon has a few other offers running alongside it. Non-Prime members who are eligible can get three months free, while new customers can use an Alexa voice offer to get three months for $0.99. Existing Individual Plan subscribers can also upgrade to the Family Plan at no additional cost for two months.

Amazon Music Unlimited goes beyond the music catalog itself. Subscribers can pick and play songs on demand, listen without ads, skip without limits, and download music for offline playback through the Amazon Music app. Eligible subscribers also get access to one audiobook per month while their subscription is active.

The four-month free period is particularly useful if you’ve been considering switching from another streaming service but didn’t want to pay for another subscription just to test it. You can essentially use the trial period to see whether Amazon Music’s catalog, recommendations, audio quality, and app experience fit your listening habits.

Just remember that promotional trials can automatically convert to a paid subscription unless you cancel before the trial ends. Amazon’s terms say Unlimited promotional plans may automatically convert, and subscriptions billed directly by Amazon continue renewing unless auto-renewal is canceled.

So, if you’re eligible for the Prime offer, four months of Amazon Music Unlimited can be a solid no-cost opportunity to give the service a proper test without committing to a monthly bill upfront.

Disclaimer: Prices and promotions mentioned in this article are accurate at the time of writing and are subject to change based on the retailers’ discretion. Please verify the current offer before making a purchase.