The poster charts the rise of the MP3 from scientific experiment to cultural infrastructure. It begins with psychoacoustic research in the 1970s–80s that explored how human hearing can be selectively modeled, enabling digital compression. These insights were formalized through MPEG standards in the early 1990s, illustrated by diagrams comparing CD audio with MP3 bitrates and explaining masking effects and frequency thresholds—showing how large amounts of data could be removed without most listeners noticing.

It then shifts to the social consequences of this technical shift: once ripping software, file-sharing, and portable players spread in the late 1990s, music circulation and listening habits were transformed. Collections became mobile, distribution models collapsed, and the industry was forced to reorganize around digital files and, later, streaming platforms. The poster ultimately frames MP3 as more than a format—as a catalyst that moved sound from laboratory code to mass-market explosion and lasting cultural change.