App Overview

Quartet 5 (Christmas) icon

Quartet 5 (Christmas)

UK Music Apps Ltd · Music

Practice and perform Christmas standards on another level with this special Christmas edition of Quartet – the top-selling live jazz standards play along app.

$7.99 · In-app purchases

PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
6 ratings · Top 5%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

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Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Quartet 5 (Christmas): map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Expand the music library by partnering with more labels.

Assumption to check: Limited catalog of songs and playlists

Validate with people who use this workflow before building.

Hypothesis 2

Implement offline downloads for playlists.

Assumption to check: No offline mode for listening

Validate with people who use this workflow before building.

Hypothesis 3

Enhance audio streaming quality and buffering.

Assumption to check: Inconsistent audio playback quality

Validate with people who use this workflow before building.

Hypothesis 4

Add sharing options for playlists and tracks.

Assumption to check: Limited social features

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

Practice and perform Christmas standards on another level with this special Christmas edition of Quartet – the top-selling live jazz standards play along app. Volume 5 includes over 50 stunning Christmas standards recorded in various jazz styles exclusively by 5 of the world’s best jazz musicians. All live studio recordings with intros and endings. Whether you play jazz piano, guitar, saxophone, trumpet, bass, drums…simply mute your instrument from the Quartet for the ultimate Christmas jazz play along. And for jazz singers too, each edition of Quartet is an unrivalled collection of jazz backing tracks powerful enough to gig with. Change key on the fly. Speed up or slow down the audio seamlessly using the very latest audio technology. Loop sections and slow them right down for practice. Improve your skills with full screen animated chord diagrams for Piano, Guitar and Ukulele. Search all 650 songs in the Quartet song library and build multi-app playlists using any of the songs from any of the 6 editions of Quartet that you own. Playlists are automated and auto-sync across each of your Quartet apps. And now you can export either the stereo mix or the original multitrack free of charge. Remix or develop the separated parts in GarageBand or whatever DAW you use. Quartet content is offered to you royalty-free, giving you endless creative possibilities. The 52 Christmas standards in Quartet Volume 5 include jazz improvisations in the style of… ‘All I Want for Christmas is You’, ‘Auld Lang Syne’, ‘Baby, It’s Cold Outside’, ‘The Christmas Waltz’, ‘Deck the Halls’, ‘Ding Dong! Merrily on High’, ‘Frosty the Snowman’, ‘Hark! The Herald Angels Sing’, ‘Have Yourself a Merry Little Christmas’, ‘A Holly Jolly Christmas’, ‘It’s Beginning to Look a Lot Like Christmas’, ‘It’s the Most Wonderful Time of the Year’, ‘Jingle Bell Rock’, ‘Let It Snow! Let It Snow!’, ‘O Come, All Ye Faithful’, ‘Rockin’ Around the Christmas Tree’, ‘Santa Baby’, ‘Silent Night’, ‘White Christmas’, ‘Winter Wonderland’…and 32 more. You can install Quartet on your iOS devices plus your Mac (‘Apple silicon’ M series chips) at no extra cost. Quartet. Take your jazz standards play along to another level! Hear more at www.quartetapp.com Featured artists on Quartet Volume 5 (Christmas) Guitar Nigel Price Nigel has recorded with many big-name artists, performing on over 50 albums, most recently Van Morrison’s studio album ‘Keep Me Singing’. Currently, Nigel is recording and touring with the Nigel Price Organ Trio. A former member of The James Taylor Quartet, Nigel was voted the UK’s ‘Best Guitarist’ in the 2016 British Jazz Awards and is “…probably the most dynamic and gifted guitarist on the British jazz scene today” [All About Jazz]. Saxophone Harry Greene Performing credits include Mica Paris, Olly Murs, Cory Wong, Incognito, PB Underground, Mo Pleasure (Michael Jackson, Earth Wind & Fire), Bernard ‘Pretty’ Purdie, Rumer, Myles Sanko, Ronnie Scott’s All Stars… Piano Graham Harvey Credits include Incognito (MD), Stacey Kent, George Benson, M People, Hamish Stuart, Will Lee, The Jones Girls, Philip Bailey, Chaka Khan, The BBC Big Band, Omar, Madeline Bell, Jocelyn Brown, Mica Paris, Kenny Thomas, Sir Cliff Richard… Bass Geoff Gascoyne Recording, performing and production credits include Jamie Cullum (MD), Sting, Van Morrison, Bill Bruford, Mari Wilson, Paloma Faith, Georgie Fame, Gloria Estefan, Guy Barker, Charlie Watts, Chris Standring, Everything But The Girl, Benny Golson, Jacqui Dankworth, Bob Dorough, John Martyn, Dianne Reeves, Claire Martin, Josh Kyle, Eartha Kitt… Drums Sebastiaan de Krom Credits include Herbie Hancock, John Scofield, Phil Woods, Dave Holland, Jamie Cullum, Guy Barker, Wynton Marsalis, Clark Terry, Tim Garland’s Big Band, Steve Watts...

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Screenshots

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Build scope

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Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

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From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.