Mathilde Marchesi was a mezzo-soprano, teacher of singing, and exponent of the bel canto technique. She was an advocate of a naturalistic style of singing: she called for a fairly instinctive method of breathing and was particularly concerned with vocal registration, calling it "the Alpha and Omega of the formation and development of the female voice, the touchstone of all singing methods". 24 excellent vocal exercises that will help develop, strengthen and warm up your voice. Specifically for Sopranos and Mezzo-Sopranos and have been used by some of the great singers of the past 100 years.