Guido Cantelli-protege of Toscanini who.died tragically in a plane crash in 1956. Toscanini wasn't told about it since he was frail at the time. Cantelli did make several recordings.
Erich and Carlos Kleiber-father and son, both gone now. Carlos' recordings have better sound. He didn't record a lot but his recordings of Beethoven's symphonies 5 and 7 are among the best.