In addition, enka songs are almost never sung without deep and skillful 'vibrato' employed (e.g., in the case of the sound lasting for over two bars, vibrato is started at the second bar).
又、必ずと言ってよいほど、「ビブラート」を深く、巧妙に入れる（例えば2小節以上伸ばす所では2小節目から入れる、等）。