The Jewish Calendar and Holidays (incl. Sabbath): Rosh HaShanah: Using a Shofar to Play Music:
Is it permitted to use a shofar to play music?
The Talmud (Rosh Ha-Shanah 33b) says that a person who
blows the shofar just to make music does not fulfill
the obligation (of hearing the shofar on Rosh Ha-Shanah).
This implies that blowing the shofar for musical purposes
is not forbidden; it just doesn't fulfill the obligation.
On the other hand, since shofars nowadays are used only
for religious purposes, it's inappropriate to use them to
make music.
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