Audio: Sound is a sequence of analog signals that are converted to digital signals by the audio card. When sound is played, the digital signals are sent to the speakers where they are converted back to analog signals that generate varied sound.
Audio files are usually compressed for storage or faster transmission. Audio files can be sent in short stand-alone segments - for example, as files in the Wave file format or as streaming sound.
Audacity: At the start of the song i decided to slow it down by reducing the tempo and speed as well as making te sound deeper by lowering the bass and the pitch.
After this i rapidly increased the tempo, speed and pitch in order to make the song quicker and more upbeat.