---
title: "SOLO [Nr.19] — App Overview"
url: https://marlvel.ai/intel-report/music/solo-nr-19
category: Music
developer: apeSoft
platforms: ios
rating: 4.4 (7 ratings)
pricing: free
report_level: overview
generated: 2026-04-28
---

<!-- SECTION: Key Insight -->
> **Key Insight:** This is a specialized utility designed exclusively for musicians performing Stockhausen’s Nr.19, replacing the need for a traditional four-person technical crew.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Music |
| Rating | 4.4 ★ (7) |
| Pricing | free |
| Platforms | iOS |
| Latest Version (iOS) | 2.2.2 |
| Developer | apeSoft |

<!-- SECTION: Summary -->
## What is SOLO [Nr.19]?

SOLO [Nr.19] is a digital implementation of Karlheinz Stockhausen’s 1966 composition for melodic instruments and feedback systems. The app automates the complex analog setup traditionally requiring four technicians, allowing a single performer to execute the piece's polyphonic requirements. It includes reference recordings by Enrico Francioni and Simonetta Sargenti for study and performance preparation.

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## Key Features

- **Digital Feedback System**: Replicates the original analog feedback setup required to create polyphonic music from a single melodic instrument.
- **Technician Automation**: Digitally performs the work of four technicians across all six versions of the composition.
- **Reference Recordings**: Provides high-quality performance examples by Enrico Francioni on contrabass and Simonetta Sargenti on violin.

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## Who is it for?

Professional musicians and students performing Stockhausen’s Solo für melodieninstrument mit rückkopplung.

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## Links

- [App Store](https://apps.apple.com/us/app/solo-nr-19/id884781236?uo=4)
- [Full Intelligence Report](https://marlvel.ai/intel-report/music/solo-nr-19)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/music/solo-nr-19).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*