In one of the more powerful prayers of the year, the Jewish world begins mentioning rain in their daily prayers beginning Musaf on Shemini Atzeret. The Moroccan version of this prayer is truly beautiful.
This piyut in honour of Shemini Atzeret is the same tune as LaEl Adom VeTzah which is sung on Pesah. I sing this piyut on the night of Shemini Atzeret and I follow it with Kadish.