We didn’t see anything surprising at W.W.D.C., and not much innovative, either. Pretty much every feature Apple showed off for its computers and phones can be found on competing devices. And I’m still dumbfounded by the music service — it looks like a mess of services and interfaces crammed into a single screen, though perhaps just the demo, and not the product, was to blame.

Still, even if little of it was new, there were some pretty useful features on display here. I’m most interested in the predictive assistant on iOS 9. I’d love for my iPhone to anticipate my needs and suggest information to me when it would be most useful. If Apple can pull off such a system, it would make up for the iPhone’s only real shortcoming against Google’s Android. We’ll have to wait till the fall, when the new OS is released, to see how well it does.

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Just before the end of the keynote, Apple announced that its music-streaming service will cost $10 a month for a single user, and $15 for a family account. It will be introduced later this month.

Finally, there’s a performance by The Weeknd, a Canadian R&B singer. Very unusual choice by Apple. I approve.

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Mr. Cue is showing a demo of Apple Music, whose interface has been redesigned from the iPhone’s current music app. He plays “Respect” by Aretha Franklin and does a little shimmy as it plays.

There’s another section, For You, that asks you to choose a few artists so that it can feed you some recommendations. The app recommends some Cuban music and Mr. Cue does an even more enthusiastic dance. The app also plays music videos.

He then plays an excerpt of Beats One, Apple’s new radio station. It sounds like any drive-time radio promo. “That’s really awesome,” Mr. Cue says after it plays.

Then he gets into Connect, a social network for musicians. There are videos and songs sent from musicians directly to fans.

Finally, Mr. Cue shows how Siri understands music. He says “Play ‘Born to Run,'” and it plays the Springsteen song.

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Eddy Cue, the Apple executive in charge of media, has just explained the music app. “When you think of Apple Music, it’s My Music, For You and New.” This means it’s split into several sections — which sounds as if they are a subset of several different music-buying services.

The rapper Drake is up on stage to explain how the Internet has helped him connect with an audience. Now, he says, that will be easier with Apple Music. “It has been perfected and simplified by the great people at Apple,” Drake says.

Is this confusing? You’re not alone. I’m having trouble picturing what exactly Apple Music will do. Either this demo is flawed, or the product is. We’ll see soon enough.

What is Apple Music? It’s a music-purchase app, a streaming app, a radio service and a social network. It also slices, dices and blends.

Mr. Iovine says that the advantage of Apple’s Music is that it is not programmed by machines but by humans. What’s more, Apple’s radio station will be programmed “not based on data,” but by the supremacy of the music itself.

“When you upload your music to Apple Music,” anything can happen, Mr. Iovine says. It’s totally unclear what this means. But it sounds pretty good.

Still, a question from J.D. Biersdorfer, who is our tech Q&A specialist:

Is Apple Music a mobile app only or does it hook into/replace iTunes on the desktop? #WWDC

— JD Biersdorfer (@jdbiersdorfer) June 8, 2015

And a comment from Ben Sisario, who reports on the music industry:

This is exactly like the Beats "on-ramp" from a year and a half ago.

— Ben Sisario (@sisario) June 8, 2015

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Mr. Cook rolled out Steve Jobs’s signature keynote line, “One more thing …,” to start his discussion of Apple’s new music-streaming service. It’s called … Apple Music. And Jimmy Iovine, the co-founder of Beats Music, which Apple purchased last year, is on stage to present it.

Mr. Iovine says that in 2015, the music industry is “a fragmented mess,” with too many different apps for different kinds of musical experiences. Apple, he says, is here to change that.

"We love music. Music is such an important part of our lives and our culture." cc @soundboy

— Ben Sisario (@sisario) June 8, 2015