Co-Founder & Program Director


Krystal Diaz


Krystal comes from three generations of influential musicians and performers and is based in Hong Kong. Since the age of 8 years old, she started singing on stage and in recording studios for television commercials for major brands like McDonalds, Kellogg's, Nissin Foods, Cathay Pacific, to name but a few.

In 2008, she Co-Founded CSMA Studio and began her career as a world-class certified vocal coach in Speech Level Singing. She later also qualified as a vocal coach under the Institute for Vocal Advancement Level 4​.

She has been featured on major TV, print and radio channels multiple times as a top vocal coach and has trained many of the most celebrated voices coming from Asia, including international singer/songwriter Bishop Briggs, internationally acclaimed actors Donnie Yen (Ip Man; Star Wars Story: Rogue One; Mulan) and Tang Wei (Lust, Caution; Blackhat), as well as top HK singer, Joey Yung, to name but a few. 

She is also a sought after vocal consultant for top music producers and record labels such as Universal Music and EEG. 

As a singer, Krystal has performed at many of Hong Kong's top venues, including the Hong Kong Cultural Centre, the Kowloon Exhibition Centre, the Hong Kong Coliseum, the Hong Kong Jockey Club and the Fringe Club.

In October 2019, her debut audiophile album, Reflections, was released under the New Century Workshop production company, and was sold out in shops within just a few days.  

Christine, Krystal & Adam backstage with vocal student Joey Yung 容祖兒


Krystal as a featured vocal coach on TVB's The Voice


Krystal also regularly works with non-singers, including actors, speakers, executives, life coaches, fitness coaches and yoga teachers, and can tailor her unique vocal training method to suit the needs and goals of her students.

In January 2020, she Co-Founded and launched the Online Vocal Academy, which is an international monthly membership program for singers. She also created the Easy Vocal Technique Formula™ course.

Krystal with International Star Connie Talbot

Christine & Krystal backstage with vocal student Kary Ng 吳雨霏


Krystal teaches in English, Cantonese and Mandarin, and is familiar with a wide range of music genres in different languages, including Jazz, Pop, Rock, Country, R&B and Musical Theatre.

Krystal with vocal student Kelly Chen 陳慧琳

Krystal's Vocal Students Include:

  • Tang Wei 湯唯
  • Kelly Chen 陳慧琳
  • Vivian Chow 周慧敏
  • Kary Ng 吳雨霏
  • Fiona Sit 薛凱琪
  • Kelly Chen 陳慧琳
  • Edmond So 蘇志威
  • Jonathan Wong 王梓軒
  • Robynn and Kendy
  • Corinna Chamberlain 陳明恩
  • Stephanie Ho 何雁詩
  • Kevin Li “Kevin 仔”
  • Ryan Hui 許懷欣
  • Donnie Yen 甄子丹
  • Cheronna @ Supergirls 吳嘉熙
  • Yanni @Supergirls 陳穎欣
  • Jessica @ Supergirls 蔡明芳
  • Isaac Dang 鄧養天
  • Lolo Lo @ Fable
  • Ken Hung 洪卓立
  • Cavan @ Reve
  • Kay @ Reve
  • Andrew Chan 陳浚霆
  • Keeva Mak 麥家瑜

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