Denise began her singing with the wonderful Sr. Agnes Cecelia Nolan through her years at St. Mary's College Arklow where she excelled in singing examinations with Trinity College. Denise then went on to train with legendary vocal coach Dr. Veronica Dunne at the Leinster School of Music and Drama and worked with renowned repetitaire’s Jenny Reddin and Alison Young.
Denise took up voice studies with the exceptionally talented Deirdre Masterson for many years and also studied composition, history of music and aural at the Royal Irish Academy of Music for two years. Denise under took master classes with Ronan Tynan (The Irish Tenors), Bill Lewis ( MET Opera New York), Morgan Crawley (West End Performer), Taylor Wilson UK (Mezzo Soprano) & Linda Hutchinson. Denise is currently undertaking a BA in Music Theatre studies with the head of vocal studies in Surrey, England Ross Campbell.
Along with Denise's vocal training she has also studied Speech & Drama and holds diplomas and certificates in both singing and acting through the Irish Board of Speech and Drama, London College of Music and The Royal Irish Academy of Music. Among Denise’s awards throughout the years at Feis Ceoil and Arklow Music Festival’s winning 1st, 2nd places in solo singing & acting competitions, Denise was recently awarded the Pearl Atock Trophy and Gold Medal at the ESB Feis Ceoil in Dublin.
Denise is a professional touring artist and has been performing professionally at home and abroad throughout concert halls, opera houses and theatres since the age of 18. Denise has enjoyed international touring success, taking centre stage in hit shows such as the internationally acclaimed “Women of Ireland” show in which Denise is a featured soloist. Denise also toured for a year with Bill Whelan’s "Riverdance The Show" and toured as a Celtic soprano soloist with the "The Dublin Philharmonic Orchestra". She also enjoyed performing as a soloist at the prestigious Bunratty Castle, Irelands National Concert Hall, The Helix Dublin as a soloist with the Applause Concert presented by "AIMS" and Ireland National Events Centre “INEC” where Women of Ireland as well as Frankie Gavin and De Dannan took up a three month summer residency to great success. Denise's voice can be heard on CD and DVD recordings made with The Dublin Gospel Choir, The Dublin Philharmonic Orchestra and Women of Ireland where Denise is a featured soloist. Denise sang for the Irish Consulate and his guests at his family home while in New York city. She took to the stage at Croke Park and performed in front of an audience of thousands for the 2003 Special Olympics with Riverdance and an international TV audience of millions. "Women of Ireland"were nominated for the best new comer group award at Irelands Music Awards alongside The High Kings.
Denise has worked with conductors Colman Pierce and Derek Gleeson during the Dublin Philharmonic Orchestra's inaugural tour of the USA. While on tour, Denise performed many songs by Irish composers including "Deirdre of the Sorrows" by Patrick Cassidy, "Suintrai" by Andea Malir, Isle of Hope & Caledonia arranged by Carl Hession and Vincent Kennedy’s very beautiful arrangement of "Mary of Dungloe" which Denise premiered in Modesto California.While at home, Denise is busy on the wedding circuit, as a concert performer and teacher of singing and drama. Denise has worked at The Co. Wexford School of Music, Innovations Theatre School, and privately where students have excelled vocally and in performance. Denise's students have been credited through the Royal Irish Academy of Music and achieving 1st & 2nd place at Feis Ceoil, Arklow and Kilcoole music festivals. It is a joy for Denise to nurture guide and support talent and see her students excel in a fun, encouraging and professional learning environment.
Denise has played many leading roles with musical theatre companies in Ireland and has experienced a great love for the theatre. Her favourite roles to date include Dorothy "The Wizard of Oz" with St. Marys College Arklow at the age of 13, Nancy "Oliver", Mary Magdalene "Jesus Christ Super Star", Laurie "Oklahoma" & Sarah Brown "Guys & Dolls. Other roles include...Molly Cassidy in the "Ha'penny Bridge and Yum Yum in "The Hot Mixado". Denise took on the Role as Musical Director for Gorey Little Theatre’s production of Aladdin and thoroughly enjoyed the experience; other shows include Godspell, Wizard of Oz and Oliver.
Denise sang with wonderful late Christy Hennessey and recorded his famous song "If you were to fall" on her album "Sailing with the Wind" which was reviewed in Hotpress magazine by Jackie Hayden - "Given the extraordinary success of Celtic Women in the US and elsewhere Brennan could do extremely well".