If you are looking for the official source to ensure a safe and high-quality download:
Ensure the track is "Free for use" if you plan to use it in a public project. Most "calm mind" tracks on these platforms do not require attribution, though it is often appreciated.
Designed for relaxation, studying, or as a background for "calm" digital content.
Usually available as an MP3 file for high compatibility across devices. How to Find and Download
If you're looking for this for a (like a video or a presentation),