This melody was composed in memory of the holy Piaseczna Rebbe (Rav Kalonymus Kalman Shapira). He was named after his great grandfather, the Maor Vashemesh (Rav Kalonymus Kalman Epstein) who was the Rebbe of Krakow (and hence a hint to the Krakow niggun).

The Piaseczna Rebbe inspired thousands of people during the darkest times of the Holocaust. He brought hope and light to everyone around him and inspired so many to serve God with simcha (happiness).
 

A moving music video about the Piaseczna Rebbe, Rav Kalonymus Kalman Shapira.