The official name of this piece is the Serenade No. 13 for strings in G major, and it was composed by Wolfgang Amadeus Mozart in 1787. Mozart himself gave the piece its nickname, when he jotted this name down in the log book he kept detailing all the music he wrote.
https://www.youtube.com/watch?v=CNRQ-DW7064

The music has been used in Charlie's Angels – Full Throttle, Alien, Ace Ventura and There's Something About Mary, as well as in countless TV programmes and adverts. It also featured prominently in the film Amadeus about the composer himself.

Mozart gave many brilliant concerts, I found one performed in Russia on a site called "Bilibili" that beautiful musical performance, investigate as converter bilibili download video online to have that concert in my personal collection.