Leading Lady for several Texas opera venues, GlayMarie has also had the honor of singing the National Anthem for the Queen's 50th Anniversary Gala, ("Our own Glay Marie Posch gave a stunning rendition..." D Linder, HMS Pinafore, 2001) and has sung "The Star-Spangled Banner" for various patriotic and sports events including the Louisiana Ice Pirates' 2000 season opener in Lake Charles, LA and three consecutive performances for The USS Cavalla Memorial dedication and remembrance. In 2001 she was featured soloist for The Bible in America Museum and annual fund raiser and HBU's President's Luncheon. She has performed as Concert Soloist with Fort Bend Symphony Orchestra, Symphony North of Houston, Houston Civic Symphony, Brasozport Symphony and Mesquite Symphony.

In 2007 GlayMarie debuted with CyFair Lyric Opera as Lalume in Kismet and with The Gilbert & Sullivan Society of Austin (GSSA) as "sweet" Rose Maybud in Ruddigore which garnered her a B. Iden Payne Awards nomination for "Best Female Actress in a Musical". Favorite operatic roles to her credit:Elsie Maynard  (Yeomen of the Guard), Patience (Patience), Rosina (Barber of Seville) and Rose Maybud (Ruddigore). Other roles to her credit are Phyllis (Iolanthe), Nellie Forbush (South Pacific), Lalume (Kismet), Chavala (Fiddler on the Roof), the youngest cousin (La  Perichol), Adlonza/Dulcinea (Man of La Mancha), and Hannah (The Merry Widow). She has sung abroad in England (1998 "Best Female Vocalist" merit award) and also with the Houston Grand Opera, Opera in the Heights, and Washington, D.C. Opera..

Mrs. Posch is a 6th generation Texan and resides near her hometown of Houston with her husband John.. She holds both a BM and MM in vocal performance, is an active member of Pi Kappa Lambda Music Honor Society, and has been on the voice faculty at Lone Star College-CyFair, Alvin College, and Lone Star College-University Park. She and her husband perform in the Houston area as The Posch Duo.

GlayMarie has been the offertory soloist at Berachah Church in Houston, TX since 1990.

"GlayMarie Posch made a dainty, 
fine-voiced Phyllis, an English Rose with 
a clean-as-crystal soprano." 
E Evans, Houston Chronicle '99