Several styles of vibrato are investigated, comparing those of Japanese traditional singing with western bel canto from viewpoints of stationarity, depth, rate, build-up time, and synchronization between F0 and power. Analyzed as Japanese traditional singing are Noh, Kyogen, Heikyoku(Biwa), Shomyo, Kabuki and Nagauta. Singers of Japanese traditional singing include living national treasures. Data are taken from a CD database edited by Nakayama, the last author of this report.