The Good: Beats Music learns about your musical tastes and gets better the more you listen. The Bad: Offline mode is more complicated than it needs to be. The Bottom Line: Beats Music's extensive playlists and spot-on recommendations mean you'll never have to hunt for music. Editors' note, July 7, 2015: After acquired the Beats brand, Apple has folded Beats Music into a new service called . At this time, the Beats Music app is still available to download, but you cannot sign up for a new account.Trendy headphones, clever advertisements, and the Dr. Dre name helped the Beats brand explode in popularity. Once the company was satisfied with making products to help you listen to music, it turned its sights on the music itself with a subscription streaming-music service, Beats Music (iOS|Android). It's also available for Windows Phone, but I won't be reviewing that version here.Beats Music shares much in common with other leading subscription music services, all of which feature very similar catalogs of over 20 million songs, thanks to deals that have been struck with the same music labels. Like , , and , Beats Music charges $9.99 a month for you to "rent" all the music you want, and either store that music on your mobile device for "offline" listening, or stream it unfettered with an Internet connection from your mobile device or desktop. Unlike some of those other services, there's no free, ad-supported option -- you either pay to listen, or you don't listen at all.What makes Beats Music stand out among these music subscription services, when they all feature roughly the same music? Just like Beats headphones, it all comes down to form and function. The apps, which are nearly identical between Android and iOS, feature a colorful, bold design that's undeniably intended to woo the masses of young people who might already have a Beats speaker or set of earbuds. But the app isn't just a pretty face; it's also full of features that help you find and organize the music you love. It also gives you an easy way to find music that suits your mood at any given time, all while Beats silently learns what about the music you like.Premium subscriptionYou'll need to sign up for an account with your Facebook or Twitter credentials or your email before you even get started with Beats. For signing up, you get a free 14-day trial to check out the service, and luckily, there's no credit card required. When your 14 days are up, you'll have to pay for the $10-per-month, or $100-per-year, subscription to keep listening. The paid subscription gets you unlimited streaming and offline listening on up to three devices, using the iOS, Android, and Windows Phone apps, the Web, or a Sonos music device. AT&T customers can also get three months for free, with an eligible service plan, and there are specially priced family plans as well.Stylish designBeats Music's design is bold, bright, and a bit whimsical, with a pinkish-red theme throughout the app. Though I like the overall aesthetic, the app can be overwhelming because it's crammed with so much content. That's most noticeable in the "Home" section, which is what you see when you first open the app. In Home, you'll find two pages that are meant to help you find music, "Just for You" and "Highlights." Both screens are a bit cluttered with album covers, descriptions, and playlists, and can be hard to parse at first.Whenever you start playing a track, you can tap on its name at the bottom of the screen to open the uniquely designed playback screen. Overlaid on top of the track's album art, there's a large reddish-pink circle that shows the progress in the song and switches to a volume level when you use your phone's volume controls. You can swipe your finger on that circle to seek through the song.Besides the standard Pause, Play, Skip, Repeat, and Shuffle controls, you can "like" and "unlike" songs with the heart and crossed-out heart buttons. Using those buttons tells Beats what you like and don't like, which helps the app make smarter recommendations. There's also a plus-sign button on that screen which opens a menu where you can share the track on Facebook and Twitter, add it to your library or a playlist, and save it for offline listening (more on that later).What music do you like?One of Beats' biggest strengths is that it thoughtfully and accurately recommends artists, albums, and playlists for you. The app does a remarkable job of paying close attention to the music you like and giving you helpful suggestions without much direction from you.After you create a new Beats Music account, the app will first ask for a bit of information about your musical tastes. You'll see colorful circles appear on the screen, first with music genres inside them and then individual bands and artists. You tap a circle a circle once to indicate that you like the music or genre, twice to say you love it, or press and hold the circle for a few seconds until it disappears to tell Beats you don't like what you see. You can refresh the genres and artists bubbles for more choices. The app will let you know when it's gathered enough information to finish setting up your account.Beats Music uses all of that information you give it to make musical recommendations. The "Just for You" section of the app shows you the albums and playlists suggested for you based on your initial music choices. That page changes frequently as you listen to and rate music.Choose your songs, or let Beats do itThere are several options in Beats when it comes to finding and listening to music and other audio tracks. You can browse the Home screens to find recommended or trending and new music, you can search by keyword, artist, or song, or you can use "The Sentence" -- a fun way to find music to listen to without picking out the songs themselves.The Sentence is perhaps Beats Music's most famous feature and it works like this: First, in the Home section, swipe over to The Sentence tab. Then, fill out the sentence you see there as if you're playing a musical version of Mad Libs. You pick where you are, what activity you want to do, who you're with, and what genre of music you want to hear.