Throughout the past month and during the coming weeks, at specific times in synagogue on the Jewish holidays of Rosh Hashanah and Yom Kippur, a shofar, or ram's horn, is blown. The religious obligation to hear the shofar, a literal and spiritual wake-up call, is special to this time of year.

But how does one make sound come out of a ram's horn? Even for veteran Orthodox Jews, the practice can be a humiliating exercise in public failure.

There are ideal conditions for successfully blowing a shofar. And even professional trombone players (like the one below) find the shofar to be a finicky instrument.

This video was produced by Chabad.org for its video portal Jewish.TV