Aliena MUSIC-HM is a xenon Hall-effect electric propulsion engine identified in NASA’s Small Spacecraft State of the Art propulsion survey. Aliena’s current MUSIC product page publishes the 4U platform envelope as less than 100 W, about 0.1–3 mN thrust, and 200–1,000 s specific impulse, and identifies MUSIC-HM as deployed in space on a 12U satellite in July 2023; this record does not assert a specific spacecraft relationship.