Fifty-five years after the release of their debut recording, Katia and Marielle Labèque celebrate an extraordinary artistic career with "55", a groundbreaking 3-CD box set that brings together new recordings and carefully curated archive treasures spanning more than half a century. The Labèque sisters' debut album, released in 1970 under the artistic direction of Olivier Messiaen, marked the beginning of one of the most distinctive careers in contemporary music. "Visions de l'Amen was our very first recording. We were 17 and 19 years old. Olivier Messiaen himself asked us to record it," they recall.

Featuring 25 new tracks (recorded in 2025, including recordings being released worldwide for the first time) and 30 historical tracks (recorded between 1970 and 2024), the album offers an intimate portrait of two artists who have consistently broken boundaries between classical music, contemporary works, jazz, minimalism, and popular traditions. "55" places special emphasis on female composers: 12 of the 55 tracks are by eight different women. Katia and Marielle reflect on these female composers: "Their apparent silence was merely a veil that history imposed upon them. Their stories – extraordinary lives and courageous fates – resonate today with remarkable power."

Beyond the musical framework, "55" is also a visual and editorial work: the box contains photographs by Brigitte Lacombe documenting more than four decades of shared artistic creation and friendship, as well as a detailed accompanying booklet with an essay by musicologist and journalist Renaud Machard, historical background, and quotes from the composers.