The melody stays. Its amplitude cycles 40 times a second.
Here, 40 Hz describes changes in the sound’s amplitude. It does not turn the whole piece into a low 40 Hz bass tone, or mean 40 beats per minute. The melody and musical tempo remain.
For listeners and caregivers
A little time. A gentle place to listen.
Six original instrumentals, created around Alzheimer’s research and 40 Hz sound. Choose a piece you enjoy and take your time comparing its versions.
6 compositions · 4 versions each · 24 audio tracks
Start listeningChoose a piece and press play
Listen for a while
Use speakers or headphones. Start at a comfortable, everyday volume.
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Download this MP3 versionOriginal speed 1×
Compare versions & view scores
The original keeps the natural sound. 25%, 50%, and 75% describe the depth of 40 Hz modulation, not playback volume. The default 25% version is a shallower listening option, not a medical recommendation.
About this piece
Understanding sound and evidence
How does 40 Hz fit into music?
Speakers or headphones can play it
These versions do not rely on different frequencies in each ear. Mono speakers and headphones can both play them. Devices and rooms can still change the sound; individual playback systems have not been calibrated here.
A brain response is different from a clinical benefit
A 40 Hz brain response in healthy participants does not establish a clinical benefit for people with Alzheimer’s disease. These original compositions have not undergone EEG or clinical-effect testing.
What the research currently tells us
An experiment with 17 healthy adults supports incorporating 40 Hz structure into music and measuring brain responses and acceptability. It did not test treatment of Alzheimer’s disease.
This trial enrolled 76 patients. Its primary efficacy endpoint did not reach statistical significance; some secondary results remain exploratory. Findings from a light-and-sound device also cannot be assigned directly to these compositions.
The 673-person trial is complete. As of November 11, 2026, results had not been posted in the official registry. Completion alone does not establish effectiveness.
Let comfort guide your listening
Use a comfortable, everyday volume. There is no need to raise it to seek stronger stimulation. Stop if listening feels uncomfortable. No treatment duration or dose is recommended here; discuss patient care and treatment with the person’s medical team.
Keep the music close
Download the music
Six compositions, each with four MP3 versions. Keep playback at the original 1× speed.