While Japan is by and large a secular society, the majority of funerals conducted in the country are Buddhist ceremonies. In most cases, the memorials are practiced more out of social custom rather than any overt religious belief.
Even so, funerals tend to be solemn events where laughter and lively music appear to have no place.
Except a joyful ceremony was exactly the kind of send-off I helped arrange for my own father when he passed away. It was his dying wish that his loved ones would celebrate his life rather than grieve over the cancer that killed him.