If you have ever followed a band or a musician through their careers and collected their albums over the years, you might have noticed something funny about the singers’ voices. More often than not, the singers sound a lot better at their later albums.
The positive results of practice– specifically, the 10,000 hour rule– cannot be underestimated. In Outliers: The Story of Success by Malcolm Gladwell, The Beatles are used as an example: they performed well over 10,000 hours of live concerts in Germany prior to gaining an audience in …

It was once thought that the earliest recording of the human voice  was made by Thomas Edison in 1877, when he recorded Mary had a Little Lamb on his new invention – the phonograph.
BUT… a new recording has turned up.