Very true....In a more technical sense, before the invention of the sound card, a PC could make one sound - a beep.
Although the computer could change the beep's frequency and duration, it couldn't change the volume or create other sounds.
At first, the beep acted primarily as a signal or a warning.
Later, developers created music for the earliest PC games using beeps of different pitches and lengths. This music was not particularly realistic and by todays standards was extrememly lame
Fortunately, computers' sound capabilities increased greatly in the 1980s, when several manufacturers introduced add-on cards dedicated to controlling sound. ie. Sound Cards.
Now, a computer with a sound card can do far more than just beep.
It can produce 3-D audio for games or surround sound playback for DVDs. It can also capture and record sound from external sources among many other things.
Thank the heavens for sound cards otherwise we'd still be listening to beep codes.
Regards