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- The Oak Ridge Boys* (RCA Nashville)
- Odetta
- Jamie O'Hara* (RCA Nashville)
- Opafire* (featuring Zachary Norman E.)
- On Call
- Robert Ellis Orrall* (RCA Nashville)
- The Osborn Sisters* (RCA Nashville)
- K. T. Oslin* (RCA Nashville)
- Out of My Hair*
- Paul Overstreet* (RCA Nashville)
Read more about this topic: List Of RCA Records Artists