Apple’s first foldable iPhone is no longer a rumour.

Apple officially unveiled the iPhone Duo on September 9, 2026, introducing an iPhone with two displays and an entirely new way of using iOS.

When closed, the iPhone Duo has a 5.4-inch external display.

Open it and you get a 7.6-inch internal Super Retina XDR display — the largest display Apple has ever fitted to an iPhone.

That could have some surprisingly interesting consequences for music streaming.

Spotify, Apple Music and YouTube Music have spent years designing their apps around relatively narrow smartphone screens.

The iPhone Duo suddenly gives them something much closer to a small tablet that still lives in your pocket.

So what could actually change?

Apple Music will work on the iPhone Duo

Apple Music will naturally work on Apple’s new foldable.

The more interesting question is what Apple does with the additional screen space.

The 7.6-inch inner display is 50% larger than the screen on the iPhone 18 Pro Max.

That provides considerably more room for:

Album artwork

Lyrics

Playlists

Your song queue

Artist information

Music videos

Apple Music Classical

Discovery

Instead of constantly moving between different screens, Apple Music could display several pieces of information at the same time.

The difference could be similar to moving from Apple Music on an iPhone to Apple Music on an iPad.

Except now the device folds back into your pocket.

Spotify should work too

Spotify already supports Apple’s mobile devices and has spent 2026 making its larger-screen interface more responsive.

Before Apple officially announced the Duo, we looked at how Spotify’s redesigned tablet interface appeared almost perfectly suited to a foldable iPhone.

Now we know exactly what Apple has built.

iOS 27 on the Duo allows applications to take advantage of the larger internal display, and Apple says developers can adapt apps specifically for the folding form factor.

Spotify could potentially switch between two different experiences.

Phone closed:

A normal compact Spotify mobile interface.

Phone open:

A larger tablet-style interface showing more information at once.

That could make Spotify one of the apps where opening the Duo genuinely changes how the application works.

The iPhone Duo supports two apps side by side

This is probably the biggest music-related change.

Apple is introducing Split View on iPhone Duo.

For the first time on an iPhone, users can open two apps side by side.

You can also open two windows of the same application or save pairs of apps that you regularly use together.

That creates loads of possibilities for music listeners.

Spotify + Safari

Apple Music + Messages

YouTube Music + Instagram

Apple Music + Notes

Spotify + TikTok

YouTube + lyrics

A music app no longer needs to completely dominate the screen.

You could listen to an album while reading an interview with the artist.

You could have Spotify open while searching for upcoming concerts.

Or watch a music video on one side while messaging someone on the other.

Music becomes part of a larger multitasking experience.

Spotify could finally have room for everything

Spotify has become considerably more complicated than a simple music player.

The platform now includes:

Music

Podcasts

Audiobooks

Music videos

Lyrics

Artist profiles

Recommendations

Playlists

Discovery

Social features

Putting all of that on a conventional smartphone screen requires lots of navigation.

The Duo gives Spotify a lot more space.

One side of the screen could show your library.

The other could show your current playlist.

Lyrics could sit next to album artwork.

Your queue could remain visible while you browse for something else.

For heavy Spotify users, the difference could feel closer to using the desktop application.

The iPhone Duo could make lyrics much better

Lyrics are one of the easiest use cases to imagine.

On a conventional iPhone, opening synchronised lyrics normally means sacrificing much of the rest of the interface.

The Duo has enough space to show both.

Imagine:

Album artwork and playback controls on the left.

Full live lyrics on the right.

That could work across Apple Music, Spotify and YouTube Music.

For listeners who regularly follow lyrics, this is one of the simplest ways the foldable screen could genuinely improve listening rather than simply looking impressive.

Apple Music Classical could benefit even more

Apple Music Classical may be particularly well suited to the Duo.

Classical music often involves considerably more metadata than conventional pop music.

A single piece might involve:

Composer

Work

Movement

Conductor

Orchestra

Soloist

Recording

Album

Apple Music Classical already has to present a large amount of information.

A 7.6-inch display makes that easier.

Instead of hiding information behind additional screens, Apple could display more context alongside the music.

YouTube Music gets a much bigger video screen

YouTube Music could be another major winner.

Unlike traditional streaming apps, YouTube Music sits directly between audio and video.

Many tracks allow listeners to move between the song and its music video.

On a normal iPhone, watching a music video is fine.

On a 7.6-inch screen, it becomes much more compelling.

The same applies to the main YouTube app.

The Duo could become a particularly good portable device for watching:

Music videos

Live performances

Concert footage

DJ sets

Tiny Desk-style performances

Artist interviews

Music documentaries

That starts to give YouTube and YouTube Music an interesting advantage over audio-only listening services.

The Duo can sit partially folded

The folding design also creates ways of using a phone that simply do not exist with a conventional iPhone.

Apple says the Duo is designed around different poses and orientations.

That means you could potentially place it partially folded on a table.

For music, the upper section might display artwork, video or lyrics while controls remain accessible elsewhere.

The exact experience will depend on how individual music services update their apps.

But developers now have a completely new physical layout to experiment with.

Apple Pencil support is unexpectedly interesting for music

Apple says Apple Pencil support will arrive on iPhone Duo later in 2026.

That is not immediately a music-streaming feature.

But for musicians, songwriters and producers it could be useful.

You could potentially use the Duo for:

Writing lyrics

Making notes about tracks

Annotating sheet music

Sketching production ideas

Editing documents while listening to reference tracks

Again, the Duo starts becoming something closer to a pocket-sized creative tablet.

Siri AI could make music more conversational

The iPhone Duo also launches alongside Apple’s much more powerful Siri AI experience.

Siri AI can understand personal context and information displayed on screen.

Apple specifically gives music-related examples with AirPods, including asking Siri to find and play a song that someone previously recommended in a message.

Combine that with the Duo’s large display and multitasking and things get more interesting.

You might have a conversation with Siri on one side of the display while looking at Spotify or Apple Music on the other.

Music discovery could become considerably more conversational.

Will Spotify redesign its app for the iPhone Duo?

We do not yet know exactly what Spotify will do.

The iPhone Duo will not be available until October 23, with pre-orders opening October 16.

That gives app developers time to optimise their experiences.

But Spotify already has a strong foundation because it has invested in adaptive layouts for larger screens.

The same applies to YouTube Music.

And Apple obviously has every incentive to make Apple Music one of the best demonstrations of its own folding display.

Will existing music apps still work if they are not updated?

Yes, in most cases.

Apple has designed iOS 27 so applications can adapt across the Duo’s different screen sizes.

The important distinction will be between an app that merely works and an app that really takes advantage of the larger screen.

The best Duo apps will not simply stretch their existing interface.

They will reorganise it.

That is where music services have an opportunity.

Could the iPhone Duo become the best iPhone for music fans?

Possibly.

Not because the phone suddenly makes streaming audio sound dramatically better.

Most serious listening will still happen through headphones such as AirPods.

The real difference is everything surrounding the music.

Bigger artwork.

Better lyrics.

More useful playlists.

A visible queue.

Better music videos.

Easier browsing.

Real multitasking.

And potentially much richer music discovery.

The iPhone has been an extraordinary music device for nearly two decades.

But the basic interface has always been constrained by the size of the screen.

The iPhone Duo removes a lot of that constraint.

Spotify, Apple Music and YouTube Music now have 7.6 inches to play with.

What they choose to do with it could be much more interesting than simply making the album artwork bigger.