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In page Joseph Shabalala:

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After local radio airplay (on the S.A.B.C. station Radio Zulu), Shabalala accepted a recording contract that was offered in 1972 by Gallo Music producer West Nkosi. The group sold over 40,000 copies of their first album and continued to do so through other recordings. In 1976, he became a Christian, and the songs in the Mambazo repertoire were shuffled to one side to include generalized Christian, Methodist, and Zionist hymns sung in the Zulu language.[2]