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Mehdi dissects the science of sound and the importance of breathing. In the company of a Tibetan bowl specialist, he tries out meditation. He discovers the ingenuity behind the making of one of the largest wind instruments: the organ.

Mehdi tries to understand how and why music has come to be associated with prohibitions over time. He sets out to discover the 'devil's notes' and looks at marginalized musical styles such as death metal.

Why do we hate certain types of music? What is noise? Why does horror movie music scare us? And should we be afraid... of milk? Mehdi does the experiment for you!

Stereo Bob, the greatest illusionist of Embrun, makes us discover the magic of stereophony and ambiophony. Mehdi discovers the auditory illusions, these phenomena which make us doubt our own ears.

Music can affect humans and animals in different ways. It can be divisive or unifying. Mehdi is interested in military music, music as a form of repression and music therapy.

Mehdi talks about the importance of echo for prehistoric peoples and explores the world of choirs. He learns more about the different timbres of voices. Booboo Dumpling and Yao introduce us to vocal cords.

To better understand his own passion for music, Mehdi delves into the careers of great self-taught creators. Exploring their musical worlds led him to take an interest in the making of both professional and rather unusual instruments.

Mehdi discovers a great artist with African origins, Miriam Makeba. We discover the importance of metronomes and metronome tracks to keep the rhythm.

Mehdi discovers the advances in the world of music since the advent of the computer. He wonders about the impact of algorithms and artificial intelligence on our society.