{"uid":"cap_SKAn3kdEDdCsmNFIcq2KQ","slug":"music-note-parser-scientific-pitch-notation-b0739f1c","name":"Music Note Parser (Scientific Pitch Notation)","description":"Parse a note in scientific pitch notation (e.g. \"A4\", \"C#5\", \"Bb3\") into its letter, accidental, pitch class (0..11), octave, MIDI number and frequency in Hz (A4 = 440 Hz).","url":"https://music.openverbs.com/v1/note","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","required":["note"],"properties":{"note":{"type":"string","maxLength":8,"minLength":1,"description":"e.g. \"A4\", \"C#5\", \"Bb3\"."}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_-skrXdih2LmOng9VrL9Gy","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Parses a note in scientific pitch notation (e.g. 'A4', 'C#5', 'Bb3') into its letter, accidental, pitch class (0–11), octave, MIDI number, and frequency in Hz.","exampleAgentPrompt":"Parse the note 'C#5' for me — I need its pitch class, MIDI number, and frequency in Hz.","exampleUseCases":[{"title":"MIDI note lookup for composition tool","prompt":"What is the MIDI number and frequency of F#4? I'm building a synthesizer patch and need the exact values."},{"title":"Frequency display in a tuner app","prompt":"I need the frequency in Hz for the note Bb3 so I can show it on a tuning display."},{"title":"Music theory education breakdown","prompt":"Can you break down the note Eb5 into all its components — the letter, accidental, pitch class, octave, MIDI number, and Hz — so I can explain it to a student?"}],"resultDescription":"Returns the note's letter (e.g. 'C'), accidental (e.g. '#', 'b', or none), pitch class (integer 0–11), octave number, MIDI note number (0–127), and frequency in Hz (A4 = 440 Hz).","failureModes":["Invalid or malformed note string (e.g. 'Z4', 'C##5') returns an error","Note out of MIDI range may return an error or null MIDI number","Empty or missing 'note' field returns a validation error","Ambiguous enharmonic spellings may be normalized or rejected"],"whenToPreferThis":"Use this endpoint when you need to programmatically decompose a note written in scientific pitch notation into its acoustic and MIDI properties. Ideal for music theory tools, synthesizer apps, tuners, or any workflow that needs frequency, pitch class, or MIDI number from a human-readable note name. Prefer this over manual lookup tables or formula-based computation when you want a validated, authoritative parse.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:40:00.640Z","isFirstParty":false}