At the end of the auditions, they needed more men. In response to a contact by Lang, the personnel director of Medical Center Hospital where her husband was a resident agreed to let participation in the choir be a perk for the hospital's employees. In its earliest beginnings, the Langs personally covered part of the expense for the music. When it appeared the group would survive, Wretha approached the hospital about underwriting music expenses in return for naming the group The Liberty Singers of Medical Center.

The group, now known as the Liberty Singers, had assumed an independent identity apart from the hospital when it had earlier planned a trip to Europe. It received funding from the Arts and Humanities Council of Charlotte County and other area organizations, including the Medical Center Hospital, after its connection with the ensemble ended.

The Liberty Singers recorded two albums in 1995, titled Slice of Americana and Faith is Like a Child. Both CDs evidence in a striking way a sound and quality of performance rivaling that of the best of professional choral ensembles.

In 1998, the group performed a fully staged version of OKLAHOMA! in the county Civic Auditorium, assisted by a sixteen piece orchestra. The following year, Linda Salisbury, in an editorial in the Charlotte Herald-Tribune, spoke of the reputation enjoyed by the ensemble and the contribution it had made to the community:

She started academy at Glendale Academy in California and graduated from the academy at Southwestern Junior College in Texas in 1952 at age 15. That summer she attended a workshop at Westminster Choir College that made a deep impression on her. She recalls,

She continued as a college student at SWJC for a year, before transferring to Union College. Following a year there, the family moved to California, where she started directing choral groups under Oliver Beltz, director of the music program for the Loma Linda University Church, and continued when Patrick Hicks succeeded him. When Hicks pursued graduate study in the summers in the late 1950s and early 1960s, Wretha directed the choir from June to September, an experience she would later recall as being invaluable.

She worked to pay off college bills before deciding to return to UC to resume her studies. In the year she returned, she met Robert D. Lang, who was planning on a career as a physical therapist. When he left for study at the medical school at Loma Linda, Wretha returned to her home in Loma Linda and continued her studies at La Sierra College, studying under John T. Hamilton and Harold Hannum. She found Hamilton's approach in presenting his choirs to be instructive, later observing, "I learned from him how to bring an audience to its feet."

Following the birth of their second child, Robert returned to college to complete the prerequisites for entering medical school and then continued study towards a medical degree. While he continued his schooling, she taught piano and voice lessons in their home and was a frequent soloist at the LLU church and with the Vincent Mitzelfelt Chorale, singing the soprano solos in many performances of numerous major choral works. She also simultaneously held church music positions at the Azure Hills SDA Church and a San Bernardino Presbyterian church.

During that time she also worked with four other singers to produce a recording used to accompany a textbook on music appreciation for use in Adventist schools worldwide. Wayne Hooper invited her to sing with himself, tenor Bob Edwards, alto LuAnne Strachan, and soprano Bunny Phillips Thornburgh to complete this project.

In 1969, the Langs moved to Orlando, Florida, where Robert completed his internship. In their year in Orlando, their four children, ranging in age from four to nine, sang frequently as a family quartet in area SDA churches and won a talent show that year at the hospital singing songs from Oliver. She also started a girls' chorus, which continued for ten years after they left.

The Lang family then moved to Charlotte County in Southwest Florida, where Robert served at the Medical Center Hospital as the emergency room physician for a year before entering private practice. Wretha was contacted during this time to form the community choral group.

While it is true the community benefited from her leadership of the Liberty Singers, she herself found musical fulfillment and gained many friends from this experience. In 1999, when she attempted to retire as director of the ensemble, Lang, reflected on her years with the group, observing:

When Lang finally retired, she received numerous tributes at her final concert in April. Naomi Donson, art critic at the Sarasota Herald-Tribune noted that the most significant tribute was a memorable performance by the group that sent the "director out in style." Later that month, the University Club of Charlotte gave her its Genesis Award, a high honor in that community, for her leadership in enriching the cultural life of Charlotte County and the surrounding area.

Both the Liberty Singers and her church choir were known for the quality of their singing as well as for the blend of their voices. Those who have studied voice with her or listened to her students know firsthand the excellence of her work as a voice teacher.

She recently wrote about another experience that helped her spiritually and allowed her to inspire others:

Dan Shultz/2009