MCP App Store
by KeenEthics

Overview

Pitch 1024 hands you a reference pitch sung by a real musician, not a synthesized beep. Ask Claude for a note, a chord sung by several voices, starting pitches for any key, or a chord progression, and tap the card to hear it in the voice of the musician you choose from a cast of five. Build a chord with several voices harmonizing together, in stereo or in full 3D around you on headphones. Pass a progression around the ensemble one singer per chord, or drill your ear with note, interval and chord-quality quizzes that keep the answer hidden until you guess, with Claude grading each answer. Useful for singers warming up, a cappella groups finding their starting pitches, instrumentalists tuning by ear, and anyone who would rather match a real voice than a tone generator. The voices are pre-recorded performances, embedded in the card and played on your device. No account is needed, and the app stores nothing about you. Tap the card once to turn on audio, since browsers block autoplay.

Tools

chord_progression

ChatGPT
Build a chord progression the musicians sing — each chord sounds together, then steps steadily to the next, looping. Two ways to give the chords: chords for a simple list (roman numerals with a key, e.g. ['I','V','vi','IV'], or symbols ['C','G','Am','F']), OR steps when each chord needs its OWN singer, e.g. Léa sings C then Soulman sings C. To repeat a chord, just list it again (there is no repeat count). Set the gap between changes with intervalMs (e.g. 2500 for 2.5s). NOT a tempo/BPM backing track: it's a steady, one-octave reference sung by real voices — for hearing a progression, practising, or singing over it.

give_harmony

ChatGPT
Several singers each take a different note and sound them TOGETHER (or staggered). Easiest: pass a chord as {root, quality, voices?} and the app builds the tones and casts the musicians (bass tone→lower voice). Or pass explicit {note,voice} pairs in voicing. Set playback:'staggered' for a rolled/round/bell-chord entrance, spatial:true to pan the voices left→right in stereo, or space for full 3D placement around the listener (headphones) — 'surround' (ringed around you), 'above' (stacked by pitch), 'approach' (front→back) — with optional motion (orbit/descend/approach). Great for chords, tuning, and immersive 'musicians all around me'.

give_pitch

ChatGPT
Sound a reference note — or a few — on the pitch pipe in ONE chosen voice. Set together:true to sound them AT ONCE as a chord in that single voice; otherwise they play in order. Use for 'give me a C', a tuning reference, or a note to match. For DIFFERENT musicians on different notes use give_harmony; for a key's starting pitches use starting_notes.

pitch_quiz

ChatGPT
Generate an ear-training drill, then COACH the user. type 'note' (name the note), 'interval' (name the interval between two notes — optionally target one with interval), or 'chord' (name the quality — major/minor/diminished/augmented). The card hides the answer (shows '?') until Reveal; the tool RESULT gives you the answer to grade with — never say it until they guess. Do NOT call give_pitch to preview the answer (it would leak). Ask them to tap the card, then answer.

starting_notes

ChatGPT
Hand a singer or a group their STARTING pitches for a key — the tonic chord tones — each voiced by the matching musician (Soprano=Léa, Alto=Blue Jay, Tenor=Soulman, Baritone=Harry Kim, Bass=Deep Bass). Pass key (e.g. 'F major', 'A minor') and optional parts (labels like ['S','A','T','B'] or a count). Plays together by default. Perfect for a cappella / SATB / SATBB.

chord_progression

Claude
Build a chord progression the musicians sing — each chord sounds together, then steps steadily to the next, looping. Two ways to give the chords: chords for a simple list (roman numerals with a key, e.g. ['I','V','vi','IV'], or symbols ['C','G','Am','F']), OR steps when each chord needs its OWN singer, e.g. Léa sings C then Soulman sings C. To repeat a chord, just list it again (there is no repeat count). Set the gap between changes with intervalMs (e.g. 2500 for 2.5s). NOT a tempo/BPM backing track: it's a steady, one-octave reference sung by real voices — for hearing a progression, practising, or singing over it.

give_harmony

Claude
Several singers each take a different note and sound them TOGETHER (or staggered). Easiest: pass a chord as {root, quality, voices?} and the app builds the tones and casts the musicians (bass tone→lower voice). Or pass explicit {note,voice} pairs in voicing. Set playback:'staggered' for a rolled/round/bell-chord entrance, spatial:true to pan the voices left→right in stereo, or space for full 3D placement around the listener (headphones) — 'surround' (ringed around you), 'above' (stacked by pitch), 'approach' (front→back) — with optional motion (orbit/descend/approach). Great for chords, tuning, and immersive 'musicians all around me'.

give_pitch

Claude
Sound a reference note — or a few — on the pitch pipe in ONE chosen voice. Set together:true to sound them AT ONCE as a chord in that single voice; otherwise they play in order. Use for 'give me a C', a tuning reference, or a note to match. For DIFFERENT musicians on different notes use give_harmony; for a key's starting pitches use starting_notes.

pitch_quiz

Claude
Generate an ear-training drill, then COACH the user. type 'note' (name the note), 'interval' (name the interval between two notes — optionally target one with interval), or 'chord' (name the quality — major/minor/diminished/augmented). The card hides the answer (shows '?') until Reveal; the tool RESULT gives you the answer to grade with — never say it until they guess. Do NOT call give_pitch to preview the answer (it would leak). Ask them to tap the card, then answer.

starting_notes

Claude
Hand a singer or a group their STARTING pitches for a key — the tonic chord tones. Pass key (e.g. 'F major', 'A minor') and optional parts (labels like ['S','A','T','B'] or a count). WITH parts, each part is voiced by its matching musician (Soprano=Léa, Alto=Blue Jay, Tenor=Soulman, Baritone=Harry Kim, Bass=Deep Bass) and they sound together by default; WITHOUT parts, the tonic tones play in order in the current voice as a quick reference. Perfect for a cappella / SATB / SATBB.

Capabilities

Interactive

Example Prompts

Click any prompt to copy it.

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