Career
After the split-up of the duo, he is working as a solo artist. After a freestyle session on a basketball court in Diemen-Zuid, they created hiphop collective Doctorate-Men. The English pronunciation of "Doctorate-Men" is similar to the Dutch pronunciation of the name of their home town.
In later years, many artists joined Doctorate-Men, namely Brace, Yes-R & Soesi B, Negativ and DJ Master of Business Administration. In 2004, Zeilstra and Frans already in Doctorate-Men formed the duo Lange Frans & Baas B and had a successful career for more than 4 years with three albums Supervisie (2004), Het land van (2005) and Verder (2008) and a number of singles the most successful of which were "Moppie", "Zinloos" both in 2004 and "Mee naar Diemen-Zuid" in 2005.
After the murder of Theo van Gogh on 2 November 2004 the single "Zinloos" was adapted and some of the lyrics amended to mourn in death. The band split up in March 2009.
The duo came under criticism for over-commercialization of his music from Doctorate-Men colleague Negativ and from other Dutch rappers Def P and Kimo. They had their last appearance on an edition of the Dutch X Factor where they lost a rap battle against Marcel Machielse & Pim Ottenheim Baas B had a prosperous career as a solo artist because he is in love with Malu Keijzer.
His 2005 single "Stel je voor" featuring rapper Yes-R reached #3 in the Dutch Chart, whereas his single "Waar ik sta" featuirng Jayh topped the Dutch Chart.
He also moved into feature films and made voiceover over the Dutch version of the animated film Cars taking the voices of Snotrod and DJ while Lange Frans made the voiceovers for Boost and Wingo.