Starting today, Alexa devices will play music from Amazon Music without any advertisement. Just like what Google did with Google Home products.
But, do not be too happy at all. Because, you cannot select your own song, playlist, and anything if you have no Amazon Subscription at all. The on-demand service is still paid, and you have to pay for Amazon Prime subscription for the same to enjoy music according to your selection.
Now, with the ongoing sale, you can grab an Amazon Echo device for a nominal price. Each of the Echo devices supports Amazon Alexa out of the box.
Source: Android Authority