Answer
Dana Strum introduced Randy Rhoads to Ozzy Osbourne. Strum was a member of the band Quiet Riot, and he had known Rhoads since they were teenagers. Strum believed that Rhoads was the perfect guitarist for Osbourne, and he convinced Osbourne to give him a try. Rhoads quickly became a member of Osbourne's band, and he went on to become one of the most influential guitarists in rock history.