432Hz Albinoni - Adagio in G minor

Music with sound harmony tuned at the frequency A4=432Hz (central La).
When compared to music tuned at the standard A4=440Hz, experts say that "the sound harmony of music tuned at A4=432Hz feels more cored in the low-frequency end, warmer in the mid-range, and more transparent and spacious in the high-frequency range". 432Hz music really sounds better.
This natural tuning was used, in the past, by many famous classic composers.

Tomaso Albinoni - Adagio in G minor for Strings and Organ - Richard Hickox Orchestra.

Some history: In the early 1950's a (small) Committee was selected (by the International Standard Organization - ISO) to decide upon an "International Tuning Standard". They chose (badly) A4=440Hz, instead of 432Hz. Why? This is a good question and I suggest you do your own research.