Sing App Guide: How Singing and Playing Works on TheONE Instruments

Singing while playing is the one musical skill that looks effortless and is not. The hands have to keep a chord pattern going while the voice does something else, and most beginners pick one or the other after a fortnight. The Sing app exists specifically to remove that choice.

This guide explains what the app does, which instruments it works with, how the chord sheet removes the hardest part, and what comes bundled with each model.

One last practical note: the app rewards short repeated sessions far more than one long one. Singing and playing together is a coordination skill, and coordination consolidates between attempts rather than during them.

Short version: the app plays the accompaniment from a chord sheet, you sing and press the lit keys, and it only works with the Sing and Sing Pro models.

What is the Sing app for?

Singing while playing, with the chords handled for you.

Singing while playing, with the app generating the accompaniment from a chord sheet so you only have to press the lit keys and sing.

The usual reason people cannot sing and play at once is not coordination. It is that playing the accompaniment properly requires a chord vocabulary and a feel for inversions that takes months, so the singer ends up either stopping to find the chord or abandoning the singing. The Sing app supplies the accompaniment itself and reduces the player's job to pressing the lit key at the right moment.

In practice that means the playing part becomes small enough to hold in your head while you sing. The app generates the accompaniment from an intelligent chord sheet, the lyrics sync with the lights on the keys, and the player follows along rather than constructing the harmony themselves. The app page describes the sequence as connect, select and interact: pair over Bluetooth, choose from the weekly-updated song library, then press the lit keys and sing.

Recorded performances can be saved and shared from inside the app, with on-screen lyrics on the video, which is the part that turns practice into something people actually do on a Friday night.

Which instruments does it work with?

TheONE Sing and Sing Pro only, not the other models.

TheONE Sing and Sing Pro only, so buying a different model in the range and expecting the sing-along app to work is the most common misunderstanding.

The app page is explicit: it works with the TheONE Sing Smart Piano and the TheONE Sing Pro Smart Piano. On any other instrument in the range, the accompaniment feature is not available, so buying a different model and expecting the sing-along app to work is the most common misunderstanding around this product line.

The two compatible instruments do the same job with different hands. The SING is the portable model built around singing and playing on the move, with built-in speakers and lighted keys. The Sing Pro adds 88 hammer-action weighted keys so the touch is closer to an acoustic piano, red and blue light guidance in the sheet music where the blue lights mark the left hand, and four built-in speakers. More on the difference between the two apps that ship with these instruments is in playing with a piano app.

How does the intelligent chord sheet work?

It builds the accompaniment from the chords you follow.

It voices the chords for you and produces a backing track in the right key, so you follow the lights while the app supplies the harmony.

A conventional chord chart tells you which chords to play and assumes you can voice them, in the right inversion, at the right time. The intelligent chord sheet does the voicing itself. What the player sees is which key to press, and when, as the lyrics move; what the app produces is a full backing track that fits the song and stays in key.

This is the same design principle as the rest of the range: the software takes over the part that requires years of practice so that the beginner can play something real on the first evening. The difference is that here the part being taken over is harmony rather than melody, and harmony is precisely the part that makes singing and playing feel impossible.

Two honest limits are worth knowing. Singing against an accompaniment does not teach you to sing in tune, and the app does not listen to the voice in the way the piano app listens to the keys. It is a performance tool rather than a vocal coach. And because the accompaniment is generated, the player is not learning to accompany themselves, so a singer who wants to do this unaccompanied later will still need some chord work. The version of that skill without any app is covered in how a piano that teaches you to play works.

What comes bundled with each instrument

The SING page lists twelve months of the Sing app and three months of Premium on the learning app, with Max available as an optional paid upgrade. Bundle terms have changed across this product line, so it is worth confirming the current offer on the product page rather than relying on a review written a year ago. For the wider context of what each app tier unlocks, see the smart piano app guide.

It is worth deciding what you want from the app before you decide which instrument to buy, because the bundle follows the model rather than the other way around. If singing is the point, the Sing range is the only option and the bundle is generous. If learning to play is the point and singing is a bonus, the same instrument still works, but you will spend most of your time in the learning app and the sing-along features will be a weekend activity. Being honest about which of those describes you saves buying the wrong model and then trying to make it fit.

Recording, sharing and the practical setup

The app records the performance with on-screen lyrics, which is enough for sharing without any additional equipment. Two connection details decide whether that works smoothly. Both instruments connect over Bluetooth, specified for iOS 15.6 or later and Android 7.0 or later, with a wired option on Android 7.0 or later through USB Host or OTG. The Bluetooth SIG maintains the specification itself, and note data between instruments and software follows the MIDI standard.

For apartment use, headphones solve the accompaniment problem but not the singing, and singing quietly is a different technique rather than a lower volume. Headphone levels are worth keeping modest for the same reason they are on any instrument; the NIDCD guidance on noise-induced hearing loss explains the cumulative part, which is the part people underestimate, and the WHO listening-safety programme covers the same ground for listening habits more generally.

If the aim is to make music a household activity rather than a solitary one, the argument for singing at the keyboard is the one NAMM makes about participation: people keep playing when other people are involved.

Two habits make the difference between an app you use and an app you stop opening. The first is keeping the accompaniment low in the mix, because a backing track loud enough to hide your voice is also loud enough to hide the timing mistakes you would otherwise notice. The second is recording early, even badly, because hearing a playback is the fastest way to find the two bars where the lights and your hands disagree. Neither habit costs anything, and together they turn the app from a novelty into something you improve with.

FAQ

Next step

Connect the instrument, pick a song you already know by ear, and let the accompaniment do the work for one evening. That first successful performance is what turns the app from a feature into a habit, and the technique can be built afterwards.

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