Essentials & Rarities (previously announced as Memories & Rarities) is a compilation album by Jean Michel Jarre, released in 2011. The double CD set consists of two distinctive CDs: Essentials, which is a compilation of Jarre's most famous work, and Rarities, which compiles tracks made before his ground-breaking album Oxygène.
Most of the tracks on Rarities had never been officially released on CD (apart from tracks from Les Granges Brûlées). The Rarities CD includes a selection of tracks from Deserted Palace, his first single "La Cage" and its B-side "Erosmachine", and the track "Happiness Is a Sad Song", which he composed in 1968 for "Les Fêtes de la Jeunesse" in Reims and is Jean Michel Jarre's first musical release. Both "Happiness Is a Sad Song" and "La Cage / Erosmachine" were composed during Jarre's time at the Groupe Recherche Musicale.