SOLO [Nr.19] app icon
Apple App StoreObserved metadata

SOLO [Nr.19]

Alessandro PetrolatiMusic5.00 · 1 ratings
Open store
Publisher
Alessandro Petrolati
Category
Music
Version
2.2.2
Last updated
Oct 3, 2021
Public page · no login requiredMetadata observed Sep 7, 2026, 8:35 PM

Research answer

What AppTrendKit can say about SOLO [Nr.19] today

SOLO [Nr.19] has no estimate-backed download or gross-consumer-spend figure that meets the public evidence contract yet.

Observed App Store metadata, chart positions, and history are shown below. Missing, non-finite, undefined-currency, or undefined-metric evidence stays missing rather than becoming zero.

Performance intelligence

Observed trajectory and estimates

Store ranks are observations. Downloads and gross store consumer spend are AppTrendKit estimates and only appear when persisted evidence exists.

Estimated downloads · 30D

Modeled

No persisted estimate

The page does not turn missing evidence into zero.

Estimated App Store gross consumer spend · 30D

Modeled

No persisted estimate

The page does not turn missing evidence into zero.

Estimated downloads · 7D

Modeled

No persisted estimate

The page does not turn missing evidence into zero.

Estimated App Store gross consumer spend · 7D

Modeled

No persisted estimate

The page does not turn missing evidence into zero.

Revenue growth · 30D
Download growth · 30D
Grossing rank
Free rank

Evidence history

Collected daily performance

No daily metric history has been persisted yet.

No backfilled days
Daily metrics will appear here after the estimator has persisted more than one observation.

Rank history

Observed chart positions

Lower rank is better. Only collected observations are shown.

No positive rank observations are stored for this storefront yet.

Coverage note

What the ranks mean

A missing rank is not treated as zero downloads or zero revenue. Apple chart feeds are bounded and may return censored or not-ranked observations outside the visible chart depth.

Read the method

Storefront mix

Top countries by estimated contribution

Country estimates are aggregated only after country-level predictions exist.

No country-level economics have been persisted for this app yet.

Monetization

Observed store economics signals

Classification
Free listing
Price
Free
In-app purchases
Not observed
Subscriptions
Not observed

These are listing and product observations. They are not company revenue, subscriber counts, or advertising revenue.

App details

Store metadata

Version
2.2.2
Released
Jul 23, 2014
Last updated
Oct 3, 2021
Content rating
4+
Default storefront
BE

Public IAP observations

Validated in-app purchase prices

Only persisted rows with an explicit public publication boundary are shown. Missing price, currency, country, or date values stay unknown.

Unavailable
No validated public IAP price observations have been persisted for this app yet.

Listing detail

What the store says

*** This app is for the Musician who want to play SOLO [Nr.19] of Karlheinz Stockhausen for Study, Live Performance, Concerts, Lessons etc... It have not sense to employ this app otherwise. You can hear fully the first version performed by Enrico Francioni (Contrabass) and the second version performed by Simonetta Sargenti (Violin) *** SOLO [Nr.19] is an algorithm that aims to implement digitally the original analog set-up for the performance of six versions of Solo für melodieninstrument mit rückkopplung by Karlheinz Stockhausen. The original composition was conceived for five persons. Four technicians plus the main instrument performer. SOLO [Nr.19], performs the work of four technicians for each of the six Stockhausen's versions. "Solo" (für Melodieninstrument mit Rückkopplung) by Karlheinz Stockhausen is a piece written for any solo melodic instrument and employs a feedback system to allow the soloist to create polyphonic music. Written in 1966 with its world premiere in Tokyo in the same year, its origin dates back to the same period as the composer's work "Kontakte". "Solo" uses the technique of recording onto tape with a single head together with a moveable arrangment of playback heads, allowing for the creation of complex sounds through accumulation. The original version (with an analog technical set-up) requires a solo instrumentalist as 4 assistants (technicians): three assistants operating the opening and closing of sliders (L/R channels)–respectively the microphone, delay-line and output–and an assistant for the change of time values of the taps in the delay-line. During a performance a part of what the instrumentalist plays is captured by a two-channel recorder. Through a feedback circuit, the sections are recorded more or less densely stacked and processed with a variable delay time; the result is then played by two sets of speakers and mixed with the direct sound of the soloist. The score (Universal Edition-Wien, 1969) consists of six pages of music and six pages of Form- Schema (the number six can be considered a key element), in addition to explanatory notes (very detailed) for the performance the composition. "Solo" is one of those compositions by the author employing "controlled alea" as a compositional language. Indeed many choices are left to the soloist and cover almost all the events: from the selection of a version, the positioning of the material, the types of tonal variation requests, the order of pages and more. In reality these faculty are provided as input by the composer through the management of macroscopic or microscopic order parameters, restricting the possible versions (virtually infinite) at a predefined or definable set of possibilities. In this piece, the role of the interpreter is very important in the creation of a performance that is always unique and unrepeatable every time.

Publisher website

Store creative

Screenshots

SOLO [Nr.19] screenshot 1
Screenshot 1
SOLO [Nr.19] screenshot 2
Screenshot 2
SOLO [Nr.19] screenshot 3
Screenshot 3

Competitive set

Similar apps

Deterministic links to real stored apps matched by category, publisher, and comparable performance bands.

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Methodology and provenance

Read every number with its evidence

Metadata source: Apple iTunes Search API; observed Sep 7, 2026, 8:35 PM.

Rankings: collected chart positions from the listed storefront. Missing ranks are not zeros.

Economics: downloads and gross store consumer spend are estimated, not official Apple or publisher figures.

Model: No persisted model version.

Confidence: ; intervals widen when evidence or history is limited.

Last observation: Sep 7, 2026, 8:35 PM.

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