Osabuohien Osaretin @only1sarz better known by his stage name Sarz, is a Nigerian record producer and musician, he is popularly known for the tag Sarz On The Beat/"Really", at the beginning or end of all his music productions In 2010 Sarz, produced the hit single “Jor Oh” and the Remix for Jahbless which featured Durella, RuggedMan, Reminisce, Ice Prince and eLDee. The song won "Best Street Hop" award and was nominated for "Best Collaboration" at The Headies.

Sarz since then has bagged several awards locally and internationally, spreading to the UK,US, South Africa, Ghana,Uganda,Zambia,Kenya etc.he has work with the international superstars like sting, drake, wizkid,skeptal,Mr easy and many more .