Thousands of Israelis responded to a call yesterday by the mother of Alon Ohel, a gifted pianist who has been held by Hamas in Gaza for over two years and is expected to be released soon in the hostage deal, asking them to play a piano melody in his honor.This morning, social media accounts run by Idit Ohel, Alon's mother, and other family members were flooded with thousands of videos of Israelis of all ages playing the piano in Alon's honor.At the piano in Hostages Square, in public pianos all