# Chorus Lesson — Personal Choral Practice app

> Personal choral practice MIDI player with part isolation and tempo control. (iPhone/iPad app by NOKKEUSI Inc..)

- Source: https://appshunter.io/ios/app/chorus-lesson/id1515226301 (this page in markdown: same URL + `.md`)
- Developer: [NOKKEUSI Inc.](https://appshunter.io/developer/482532151)
- Category: Music, Lifestyle
- Price: $2.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 228 MB
- Languages: American English, French (France), Japanese, Chinese (Simplified, China)
- Released: 2020-09-19
- Data updated: 2026-08-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/chorus-lesson/id1515226301/reviews.md

## What is Chorus Lesson?

Chorus Lesson is a kind of MIDI player, build for the use of personal lesson of chorus.
The app allows you set mute, soloed, volume, panning and instrument for each part.
 
You may check your melody line by enabling only your part.
Then, sing hearing the overall flow and sound of other parts.
You may also change the playing speed, you can practice your part carefully at your suitable tempo.

You can play standard MIDI files with this app.
In addition, we have a Song Data Shop in this app.  You can purchase and download song data in-app purchase.
These songs in the shop are originally created for use with this app.  Currently, the number of songs is small, but we will gradually increase it.

* Some MIDI files may not be played well because of too many parts in the file.  We assume a midi file contains five to six parts of SATB and accompaniment piano + some more parts. 
And we recommend MIDI file of format type 1, although you may still use type 0. 

Interchangeablitiy:
We have tested MIDI files generated by applications belows and some unknown apps.
   Finale(mac)
   Notion(iPad)
   Nanostudio2(iPad)

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- MIDI player for choral practice
- Mute, solo, volume, panning per part
- Adjustable playback speed
- Play standard MIDI files
- Purchase song data in-app

## Pricing and in-app purchases

Base price: $2.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 30-days Trial for free | Free | one-time |
| BWV227 All through | Free | one-time |
| BWV226-1 Bars 1-145 | Free | one-time |
| BWV226-2 Bars146-244 | $0.99 | one-time |
| BWV226-3 Bars245-268 | $0.99 | one-time |
| BWV226 Complete set | $0.99 | one-time |
| BWV225 Complete set | $0.99 | one-time |
| BWV228; Fürchte dich nicht,... | $0.99 | one-time |
| Trial for 14 days | Free | one-time |
| BWV229; Komm, Jesu, komm | $0.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/chorus-lesson/id1515226301/reviews.md

### 1/5 — 運営動いてる？？

*2022-11-03*

第九のデータの一部が間違ってる（319小節のアルトがソプラノに置きかわってる）とメールしましたが対応ないです

**Developer response:** ご連絡ありがとうございます。
support@nokkeusi.comからメールにて回答させていただいたのですがおそらく届いていないものと思います。連絡がつかず心配しておりました。

第九の音源についてご指摘いただいたことありがとうございます。既に修正も済んでおります。

追記)
 バージョン1.62より、音源データのアップデートが容易にできるようになりました。

よろしくおねがいします。

## Frequently asked questions about Chorus Lesson

### What is Chorus Lesson used for?

Chorus Lesson is a MIDI player specifically designed for personal choral practice. It helps users isolate individual vocal parts, adjust their settings, and practice at their own tempo.

### Can I play any MIDI file with Chorus Lesson?

You can play standard MIDI files with Chorus Lesson. However, files with a very large number of parts, such as those with more than five to six SATB parts plus accompaniment, may not play optimally. Format type 1 MIDI files are recommended.

### How does Chorus Lesson help with practice?

Chorus Lesson allows you to mute or solo specific parts, adjust their volume and panning, and change the playback speed. This enables you to focus on your individual part while hearing the context of the other voices.

### Does Chorus Lesson have ads?

Chorus Lesson does not contain advertisements. Its monetization comes from the option to purchase additional song data within the app.

### What devices does Chorus Lesson support?

Chorus Lesson is available for iPhone and iPod. It was last updated on June 17, 2026, indicating ongoing support.

### How much does Chorus Lesson cost?

Chorus Lesson is available for a one-time purchase of $2.99. Additional song data can be bought within the app.

### Where can I get more songs for Chorus Lesson?

You can purchase and download additional song data directly within the app through the Song Data Shop. The selection of songs is currently small but will be gradually expanded.

### What is the age rating for Chorus Lesson?

Chorus Lesson has an age rating of 4+, making it suitable for a wide range of users interested in music practice.

## Version history (last 5 releases)

### 1.71 — 2026-06-17

Supports the latest libraries and improves the responsiveness of the player screen startup.

### 1.70 — 2026-04-20

Redesigned the Library screen with a cleaner, more intuitive layout for improved usability.
Also updated internal processes to ensure compatibility with the latest OS.

### 1.62 — 2023-02-21

Added a function to download and update a revised version of your purchased music piece, when it is available at the song data shop.

### 1.61 — 2021-08-13

Fixed a bug related to determining the purchase status.

### 1.60 — 2021-08-12

The trial function has been removed from version 1.60.
Some minor bugfixes were also made.

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## More apps by NOKKEUSI Inc.

- [Engineer Work Time](https://appshunter.io/ios/app/engineer-work-time/id570585356)
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All apps by NOKKEUSI Inc.: https://appshunter.io/developer/482532151

## Related topics

[dawn chorus](https://appshunter.io/ios/topics/dawn-chorus)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-10.*