On the First Day of Shabhu'ot, immediately after the morning prayer, we read the entire Hallél (Ps. 113-118), part of it is sung to the following Shabhu'oth melody.
According to the Book of Exodus, the first part of the Torah that was revealed to the people of Israel was the Ten Pronouncements, more popularly known as the Ten Commandments. On Shabu'oth, the Ten Commandments are read in synagogue. This recording reflects the Western-Sephardi tradition that reads the Ten Commandments in a special tune called the "High Na'oom", or the "High Tune". Only very few parts of the Torah are read in this manner.
On the first day of Shabhu'oth, we read from the Book of Exodus, chapters 19 and 20.
At the end of the service or in the afternoon, we read the Book of Ruth.