MARTIN: This is one of the songs on the new Marvin Sapp album, "If I Were An R&B Singer." So that made me think of what his mom told him all those years ago. Why can't you sing gospel and secular ...

For decades, Marvin Sapp has been one of the most admired and successful gospel singers in the country. (SOUNDBITE OF SONG, "NEVER WOULD HAVE MADE IT") SAPP: (Singing) And I never, never would have ...