According to Japanese copyright law, the reproduction of a work to use the copy personally just for fun or learning within a household or among a small number of friends (not for business purposes), e.g. recording music at home and copying a thesis for personal learning, does not need the authorization of the author.
At the wedding receptions, music is essential factor. Music is played, performed, and used for video works to be screened at the venue in front of “participants”.
In terms of “participants” of wedding receptions, they usually consist of a large number of specific persons, and recognized as “public”.
Therefore, use of music at the wedding receptions is not considered to be personal use and clearance of copyright and neighboring rights is required.