It's also free and supported by ads, though you can opt to pay to ditch the ads and take advantage of fancy features like offline downloads, and background listening.
The route to YouTube Music's launch hasn't been entirely straightforward.
YouTube Premium contains all of that, but brings original content from top YouTubers and the highlighted paid perks across the whole of YouTube. While YouTube Premium includes a full video service, albeit for $2 more ($11.99) per month than the YouTube Red service it replaced.
YouTube Music offers plenty of personalization, access to music videos, curated playlists, smart search, and much more.
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Google is also rebranding its YouTube Red services as YouTube Premium offering ad-free music streaming alongside a video platform. The additional markets being added today are: Austria, Canada, Finland, France, Germany, Ireland, Italy, Norway, Russia, Spain, Sweden, and the United Kingdom. If other music streaming services leave you wanting, you can now see if YouTube Music satisfies in a handful of regions around the world.
Voice search lets you find songs in the style of someone humming in a record shop.
With YouTube's global audience of nearly two billion, Max Lousada, CEO, Recorded Music, Warner Music Group and Chairman & CEO, Warner Music UK said "the potential prize here is huge", adding: "The original way the service brings together music and video, as well as its big launch campaign, shows YouTube is making a commitment to subscription".
Possibly the coolest feature, however, is something called "Offline Mixtape": this automatically downloads a pre-selected amount of songs each day so you've always got something to listen to. Of course, this isn't the first time Google has tried to carve out a space for itself in the music streaming market, but it seems the company is hoping that the YouTube name pulls in more subscriptions than Google Play Music did. It also grants you access to YouTube's original content, including the Karate Kid sequel series Cobra Kai they couldn't shut up about a Google I/O.
Current Google Play Music subscribers in any of the 17 countries the service is available, will automatically get updated to YouTube Music Premium. There's no word on when or if those customers will get a price hike.