Home/Guides/Piano buzzing, rattle or tone change
Owner's guideBuzzing, rattling or sounding different? What to note before calling a technician.
A piano that buzzes on certain notes, rattles when played loudly or sounds different from a few months ago is telling you something. This guide helps you describe what you hear, check for obvious external causes and give the technician useful information.
Published 19 October 2026 · 2 minute read · Written for buyers, not for any one instrument
Name it before calling a technician.
Before calling a technician, sit at the piano and note the following:
- What kind of sound? A buzz (a vibration on certain notes), a rattle (something moving), a click or knock (a mechanical noise from the action), or a tone change (the piano sounds different from how it used to).
- Which notes? One note, a group, the bass, the treble, or the whole keyboard. Write down the specific notes.
- At what volume? Only when playing loudly, only when playing softly, or at all volumes.
- With or without the pedal? Does the sound happen only when the sustain pedal is down?
- When did it start? After the last tuning, after a move, after the air conditioning was changed, after the rainy season, or gradually over months.
These details help explain the concern before a visit; a diagnosis may still require inspection.
Check for external causes.
Before booking a service, check whether the cause is something on or near the piano rather than inside it:
- Objects on the piano: a vase, a photograph frame, a metronome, a book or a lamp. Remove everything from the top of the piano and the bench and play the buzzing notes again.
- Objects near the piano: note anything touching the case. Remove only a loose item that is straightforward to handle; do not move the piano or shift heavy furniture to investigate.
- The music desk: note whether the sound changes during ordinary use, and ask the technician to investigate. Do not adjust its fittings.
Note whether the sound changes after a straightforward external check. A change or a persistent sound does not establish a diagnosis; describe it to the technician and ask what assessment is appropriate.
When to book a service.
Book a technician if:
- The buzz or rattle persists after you have removed everything from on and around the piano.
- A note sounds noticeably different from its neighbours.
- The piano's overall tone has changed.
- You can see visible damage on the outside of the case.
- A string has broken.
Tell the technician which notes are affected, at what volume and when the problem started. The tuning service page has booking details. The tuning, regulation and voicing guide explains what each type of service addresses. The sticking keys guide covers mechanical key problems, which are a different symptom.
What to expect from the visit.
The technician will inspect the instrument to find and identify the cause of the sound. Possible causes include loose parts, structural issues, tuning problems, or wear on the action and felt. The specific cause and the work needed can only be determined by hands-on inspection.
After finding the cause, the technician can quote the work needed. Ask what can be assessed or completed in the proposed visit and whether follow-up would be separately quoted. Ask for the quotation in writing so you can decide whether to proceed.
If the piano needs work beyond what your technician offers, they can advise on the type of specialist needed. Yamaha Singapore's service page describes the categories of piano service work for reference.
Sound problems, answered.
Why does my piano buzz on certain notes?
A buzz on specific notes can come from many causes, including something resting on or against the instrument. Check for external objects first. If the buzz persists with everything cleared, a technician needs to inspect the instrument to find and address the cause.
Is a rattle in a piano serious?
It depends on the cause, which only a technician can determine by inspecting the instrument. It may be something as simple as an object that has fallen into the case, or it may be a structural issue. Book a service if the rattle persists after you have checked for external causes.
Why does my piano sound different from before?
Gradual tone change can result from the piano going out of tune, from changes in the room climate, or from wear on the hammers and action. A sudden change may indicate a broken string or another mechanical problem. Describe what changed and when you first noticed it.
Can humidity cause a piano to buzz or rattle?
Humidity can affect wooden and felt parts over time. Whether a specific buzz or rattle is caused by humidity is something a technician assesses by inspecting the instrument. Describe the sound and the room conditions when you book.
Where the rest is set out on this site: Keys sticking or sluggish → Tuning guide → Tuning vs regulation vs voicing → Tuning and service booking → All guides →
Hearing something wrong?
Send the piano model, describe what you hear and which notes trigger it. We can advise whether a tuning visit or a specific service assessment is the right starting point.