What is an Amplifier?
There are few inventions that have been as crucial to the evolution of pop and rock music as the guitar amplifier.Indeed, many cite the 1951 Sun Records recording session of Jackie Brenston and his Delta Cats' iconic "Rocket 88" -- one of the earliest instances of distorted electric guitar on record -- as the moment rock 'n' roll was born.
Source: americansongwriter.com