Singers often wonder how to add that special shimmer to their voice. Vibrato is the key to giving your singing that professional sound. It’s that gentle wavering of pitch that makes a note come alive.

Anyone who’s been enveloped in the velvety vocal phrasing of jazz legend Ella Fitzgerald, the operatic oscillations of “King of the High C’s” Luciano Pavarotti, or the melismatic melodies of Mariah ...