HALACHA V’LO L’MA’ASEH
In Shulchan Aruch Y.D. 368 – 1 it says:
In a Bais Hakvoros you may not behave lightheartedly (Kalus Rosh)*. The Mechaber
and the Rema enumerate in detail a long list of things that are considered Kalus Rosh,
(relieving oneself, eating & drinking, reading and learning etc. -- )
Dancing & music in a Bais Hakvoros is not listed as a Kalus Rosh behaviour.
What is the reason there is no mention of dancing & music as Kalus Rosh?