What group did Beyoncé join as a founding member before her solo career?

Beyoncé joined Destiny's Child as a founding member before beginning her solo career.

The group developed from a Houston teenage group originally called Girl's Tyme. Its early lineup included Beyoncé Knowles, Kelly Rowland, LaTavia Roberson, and LeToya Luckett. After changes to the lineup and a record deal with Columbia Records, the group became known as Destiny's Child.

Destiny's Child rose to major success with songs including “Say My Name,” “Survivor,” and “Bootylicious.” Beyoncé was the group's lead vocalist, while the group became known for tightly arranged harmonies, choreographed performances, and themes of independence.

The final trio consisted of Beyoncé, Kelly Rowland, and Michelle Williams. Destiny's Child went on hiatus in 2006, allowing its members to pursue individual projects. Their group success is an important part of Beyoncé's career, but it is distinct from her later solo discography.