Bart Zeilstra, better known by his stage name Baas B, is a Dutch rapper and singer who was a founding member of Dutch rap formation D-Men and between 1997 and 2009, a member of the Dutch hip hop duo Lange Frans & Baas B both formed with his childhood friend Frans Frederiks better known as Lange Frans. After the split-up of the duo, he is working as a solo artist; the duo eventually reformed in 2019.

Frans Christiaan Frederiks, known by his stage name Lange Frans, is a Dutch rapper and television presenter. From 1997 to 2004 he was a member of the band D-Men. Between 1997 and 2009 he was part of the Lange Frans & Baas B duo before starting a solo career. In 2019 the duo reformed and made a few appearances, but in April 2021 Baas B returned with a solo album, claiming that he and Frederiks were no longer on the same page "in terms of message". Before taking the stage name Lange Frans, he used the name Akela.