Our Overture series of first looks has already taken in a tool that files your scores. This time, it’s one that helps you practice — without trying to automatically recognize the music or follow along with your playing.
SheetCue, a free app for iPhone, iPad, and Android from developer Kwangho Bae, calls itself a “measure-first score viewer.” You bring in a score you already own — a PDF, or photos of the printed page — and instead of simply paging through it, you turn it into a structured practice flow. You define the measures, tell the app the order you will actually play them in, set a tempo, and then rehearse measure by measure while a timed cue moves you along.
How it works
Importing a score kicks off three quick setup screens. First you split the measures, drawing the staff rows and adding barlines where the printed music needs them. “It’s not a review-free automatic-detection flow, but it also does not necessarily require drawing every barline from scratch,” according to Kwangho.
Then you set the order — the route you will actually take through the piece, including repeats, cuts, and page returns. So, for instance, a jump from the bottom of page two back to page one simply becomes part of the sequence. Finally, you enter a title, a BPM, and a default number of beats, and you’re ready to play.
From there, SheetCue shows you the current measure and advances to the next one according to the timing you have set, without requiring you to tap for every bar. A metronome, speed control, an A–B loop, and a running display of the current measure’s duration are all available. You can work in a focused measure view or return to the full page.
Simplicity: no automatic transcription, no audio following
SheetCue does no automatic transcription and no audio following. It’s not listening to you play and trying to keep its place, and it is not running your scan through optical music recognition to rebuild the notation. You do the mapping yourself, and the app follows your plan rather than your playing.
That is a deliberate choice, Kwangho told me. “Choosing manual review was both practical and philosophical. I did not want SheetCue to guess from audio or notation and fail at the exact repeat, cut, or re-entry that matters. The musician reviews and corrects the measure boxes, then explicitly sets the timing and route. SheetCue follows that plan—not the performance—which keeps control with the player and works across instruments and arrangements without presenting the setup as fully automatic.”
Audio score-following is a complex problem, and OMR still generally requires some cleanup. SheetCue avoids both by putting the musician in charge of defining the measures and route in advance. The tradeoff is a few minutes of setup in exchange for a rehearsal flow that should behave predictably. How worthwhile that tradeoff is will depend largely on how quick and forgiving the measure-drawing process is in actual use.
Who it’s for
SheetCue is aimed at the practicing musician, not the engraver or librarian: the student drilling a movement, the amateur working up a recital piece, or anyone who wants to work through a passage measure by measure with a metronome and loop, using a score they already have and nothing more than the phone in their pocket.
It is a narrower proposition than a full iPad score reader like forScore, and really a different one. It is less about gigs, setlists, and managing a library, and more about the practice room, lessons, and rehearsals where repeats, cuts, and section re-entry need to be worked out.
Score handling is local-first: the PDF, rendered pages, cropped measure images, and your presets stay on the device, with no account and no score upload. The app is free, supported by ads (with a consent prompt) and an optional in-app Plus upgrade.
A cool idea meets vendor lock-in
I like the idea, but SheetCue isn’t the only place I’ve run into it. Just last week, my friend and Scoring Notes contributor Jake Winkler showed me a prototype he had built that did much the same thing, although he arrived at it for a different reason: accessibility.
His aim was to make a static PDF usable for a sight-impaired choral singer, allowing the musician to follow the music one region at a time at a much higher zoom on an iPad in landscape orientation. That two developers independently arrived at a similar basic approach — one for practice, the other for accessibility — suggests there may be something useful here beyond either particular implementation.
Where I have some difficulty is figuring out how this fits into the existing score-reader market, and I say this as someone who generally roots for new developers. I have a hard time picturing the large forScore user base uprooting an entire annotated library and moving it into a new app for this one feature, and Kwangho agreed.
“I do not expect musicians to abandon a mature score reader or an annotated library,” Kwangho said. “I see SheetCue as a phone-first practice and rehearsal companion: bring in a score photo, JPG, PNG, or PDF you have the right to use when you need a measure-level route and timer, while continuing to use the library tool you already rely on. Its job is not to replace the library; it is to prepare the exact route you plan to play.”
One possibility is that an established reader — forScore being the obvious candidate — eventually incorporates something like this, because much of the groundwork is already there. forScore’s Crop tool reframes and zooms a page on screen without touching the underlying PDF, and its Rearrange tool lets you bake a performance route — repeats, cuts, the right next page — into the file itself.
What SheetCue adds is greater granularity and a clock: it takes those ideas down to the system, excerpt, or single measure, and then advances through them on a timer. Extending Crop and Rearrange to work measure by measure rather than page by page, with a timed practice mode on top, seems like the kind of feature an established reader could absorb more easily than a newcomer could persuade users to build an entirely new library around.
That is essentially the same advice I gave Jake, and the same I might offer Kwangho: rather than build a reader around the feature, consider bringing the feature to the readers people already use. I will set aside any copyright and patent questions; I am talking here only about the practical realities of the market.
The bigger issue, though, has little to do with SheetCue specifically. It is vendor lock-in among score-reader apps. Once you have drawn your measures, marked your cuts, and — in a full-fledged reader — added your bowings and rehearsal annotations, most or all of that work is trapped inside one app, often on one kind of device. Move to another reader and you may have to start over.
I keep hoping the field will eventually develop some kind of open standard that lets a library travel from a focused tool like SheetCue to a more robust library app like forScore with its annotations, bowing layers, and markings intact — or allows the same files to live in several apps and on several kinds of hardware at once. That would be especially important for orchestras and other institutions, which otherwise have to commit to a particular device and application in order to build a shared digital library.
Maybe that is naive. A common format could flatten some of the differences that make these apps worth choosing, and perhaps reduce the incentive to innovate. But as long as a section’s markings are stuck in whatever app created them, vendor lock-in will remain an obstacle to institution-level PDF libraries — the kind meant for real-time use on the stand — becoming as widespread as they otherwise might.
These are precisely the questions the 2027 MOLA Tech Fair has been convened to take up: how a score travels across its entire lifecycle, from source to score to stand, and how much of that journey should depend on the app or device where it started. SheetCue is a relatively small-scale example, but it touches on the same larger issue. We will keep coming back to it.
I haven’t put SheetCue through a real practice session. The measure-mapping process, and how naturally the timed cues carry you through repeats and page returns, are the things I would pay particular attention to when evaluating it. It costs nothing to download, and whatever becomes of SheetCue itself, the basic idea is clear and worth exploring.
If you take SheetCue for a spin, or simply have thoughts about the idea or the broader issues raised here, please leave a comment below.
