If you're not, this unfortunately isn't a service you can opt into - rather, it's a nice free perk for Prime members. Price: Prime Music is free if you have Amazon Prime.

I was impressed by the selection and did not feel that it was lacking in any way. With 50 million songs, Music Unlimited fills all the holes.

Prime Music has a variety of artists, but many of my favorite artists only had one song on the platform. Prime Music's 2 million songs may sound like a lot, but most streaming services offer tens of millions of songs - making 2 million look pretty meager.

Selection: The most notable difference, in my opinion, is the selection.

Offline listening: Both services let you stream music when you're offline, except for the Music Unlimited single-device plan, which is the lowest-cost option that works solely with one Alexa-enabled device - this is understandable as you need internet to power your Alexa device.

Alexa interaction: You can use your voice to control music playback through Alexa with both services.

You'll find thousands of curated playlists and personalized stations based on your listening history in both models.

Interface: The interface is the same across both services.

With both Amazon services, you can skip an unlimited number of songs and listen for as many hours as you'd like. That means you have to listen in shuffle mode and can only skip a number of songs a day.

On demand: Many 'freemium' streaming services don't let you listen on demand unless you pay for the service.

Ad-free listening: Whether you have the free version or pay for the premium upgrade, Amazon will always let you listen without ads.

But, at the core of it, both of the services share a variety of features. Amazon Music Unlimited is the souped-up version of Prime Music.

Amazon music unlimited cost