This is probably the most well-known of the works of Alexander Ilyinsky (1859-1920), a Russian composer. Cradle Song is from the Noure and Anitra Suite.
This arrangement The harp part is two pages in length and quite simple, but very effective. The arrangers are Diane L. Mayer and Margaret R. Tucker.
INTERMEDIATE LEVER OR PEDAL HARP
For more information about this composer, who really deserves more notoriety that he is given: http://www.unsungcomposers.com/forum/index.php?topic=507.0