The Holy Liftoff (2024) is the 11th installation of Claire Chase's 24-year Density 2036 project, an initiative to create a bold new repertory for the flute by the 100th anniversary of Edgard Varèse's seminal 1936 flute solo, Density 21.5. Density 2036 has been called "one of the great musical undertakings of our time" by The New York Times, and "a quarter-century journey that has little precedent" by The New Yorker.

Terry Riley began composing The Holy Liftoff in 2022 as an open score sketchbook brimming with colorful drawings that were intended to be played by Chase with any number of collaborating musicians. Over the following two years, the sketches evolved into a multidimensional work that now combines extensive through-composed material as well as graphic notation, evocative artwork, and Riley's signature open-form scoring that can be freely interpreted by the performers in variable durations and ensemble formations. Samuel Clay Birmaher's 60-minute realization of the work, which he composed in close collaboration with Riley and the performers, is scored for multiple flutes and string quartet.

"When I improvised the first 16 bars of 'The Holy Liftoff' the melody and the chords whispered it's name while simultaneously urging me to make drawings of the experience. The drawings had angels and flying creatures and all the energies were rising up into a surrealistic skyscape... This piece could only have been written for Claire Chase." -Terry Riley