Just as it is performed on a weekday, so it is performed on the Sabbath, except that he would fill an unconsecrated golden barrel on the eve of the Sabbath from the Shiloach, and place it in a chamber.  If they were spilled or uncovered, he would refill it from the laver, for uncovered wine and water are unfit for the Altar.

The flute [is played] five or six [days]; this is the flute of the Beis HaSho’evah, which overrides neither Sabbath nor Festival.  They said, “Whoever did not see the rejoicing of the Beis HaSho’evah, never saw rejoicing in his lifetime.”