In this guide
Pitch is how high or low a sound is perceived. It is closely related to frequency for a steady musical tone, while loudness and tempo describe different properties. An octave above a pure tone has twice its frequency.
For the underlying audio concept, see what sound frequency means, including hertz, wavelength and spectrum examples.
Pitch is the perceived highness or lowness of a sound. In music, pitch helps distinguish a low bass note from a higher note sung or played on an instrument. A melody moves among pitches over time, while harmony involves how notes relate when heard together.
For a steady, simple tone, pitch is closely related to its frequency: more cycles per second generally correspond to a higher perceived pitch. Musical sounds can contain several frequencies, and the perceived pitch of a complex or noisy sound is not always the frequency of its loudest component.
Pitch and frequency: what does hertz mean?
Frequency is measured in hertz (Hz), or cycles per second. A steady 440 Hz sine wave completes 440 cycles per second. A sine wave at 880 Hz is one octave above it; 220 Hz is one octave below. These are frequency relationships for the tones, not a measurement of their playback volume.
| Sine tone | Frequency | Relationship |
|---|---|---|
| A3 | 220 Hz | One octave below A4 under the A4 = 440 Hz tuning reference. |
| A4 | 440 Hz | A commonly used tuning reference. |
| A5 | 880 Hz | One octave above A4: twice its frequency. |
The tone generator can create a short sine-wave WAV at a chosen frequency. Start at a comfortable low playback volume. The file is a digital reference, not a calibrated speaker, room or hearing measurement; devices may reproduce frequencies differently.
Pitch vs. loudness, tone and tempo
| Property | What it describes | Example |
|---|---|---|
| Pitch | How high or low a sound is perceived. | A higher sung note compared with a lower one. |
| Loudness | How loud or quiet a sound is perceived. | The same note sung more softly or forcefully. |
| Timbre | The character that helps distinguish sounds, influenced by spectrum and how the sound changes over time. | A piano and a flute playing the same note can sound different. |
| Tempo | The pace of a musical pulse. | A melody can be played faster without intentionally changing its notes. |
Turning playback volume up does not, by itself, transpose a melody. Likewise, tempo and pitch are separate musical choices, although changing a recording's raw playback rate can change both. The tempo guide explains beats per minute.
Notes, semitones and octaves
In the familiar twelve-tone equal-tempered system, an octave is divided into twelve equal semitone steps. Moving from C to the adjacent C♯/D♭ key on a piano is one semitone; moving from C up to the next C is twelve. Other tuning systems and musical traditions can organize pitch differently.
A note name alone does not specify register. C4 and C5 are both called C, but C5 is an octave higher. Open Music Theory distinguishes a specific pitch from a pitch class, which groups octave-related notes.
Pitch vs. key: are they the same?
No. A pitch can describe one heard note or tone. A musical key describes a tonal center and the relationships around it in a passage or piece. A song in C major contains many pitches; hearing one C does not by itself prove the whole song is in C major.
If you need to estimate a recording's key, use the song key finder as a starting point and compare its candidates by ear. It analyzes a supported local audio excerpt and can be wrong, especially when a passage is ambiguous or changes key. The key-by-ear guide explains how to test a tonal center.
How to change the pitch of a recording
- Choose the source and shift. Keep the original. A positive semitone value raises the selected audio; a negative value lowers it.
- Prepare a copy. The audio pitch changer accepts supported mono or stereo MP3 or WAV files up to five minutes and 50 MiB. Choose −12 to +12 semitones, prepare a WAV or MP3 and preview the actual export. Output limits also apply.
- Listen in context. Check voice character, instrument attacks and the ending. Pitch shifting can introduce artifacts; all sounds in a mixed file move together, and this tool does not preserve vocal formants.
- Check timing if needed. The tool aims to retain nominal tempo, but a processed tail can extend the result and MP3 may add delay or padding. Verify alignment in the destination editor.
For a specific musical key, see how to change the key of a song. Shifting every note equally transposes a recording; it does not convert a major arrangement into a minor one.
How can I check a sung pitch?
The vocal pitch monitor estimates a sustained microphone signal's frequency and nearest equal-tempered note using A4 = 440 Hz. Use one comfortable note in a quiet room and stop the microphone afterward. The browser processes the live signal locally; the tool does not record or upload it.
The display is a momentary estimate, not a score or proof of tuning accuracy. Background sound, vibrato and octave errors can affect it. It does not separately detect multiple singers or establish a song's key.
Common questions
Is pitch the same as frequency?
They are closely related for a steady musical tone, but frequency is a physical rate and pitch is a perception. Complex sounds can have several frequencies and an ambiguous perceived pitch.
Does a higher pitch mean a louder sound?
No. Pitch and loudness are different properties. A high note can be quiet, and a low note can be loud.
Can I change pitch without changing tempo?
Pitch-shifting tools attempt that, but can change texture and may not preserve exact timing. Preview the actual output and check it in your project.