T he Mamilla Mall which connects several five-star hotels to the Old City’s Jaffa Gate has become one of Jerusalem’s most popular venues for shopping dining and just strolling about and taking in the vibrant scene. On many days it’s the site of an unexpected spiritual encounter as well — at least for those who follow the haunting music to its source: A Yerushalmi-garbed Yid who plays the guitar while singing Jewish songs that create a holy yearning in the soul.