More digression from "Tune Info."
Supercede, as well as supersede, both have long histories, going back at least to the 15th C., in spite of the fact that the 'sede' comes from sedere. 'Supercede' is erroneous but, as S O'P notes, common usage should not be sneered at.

(I wonder, does M M'L use the spelling recognize (OED) or recognise, as do 90 some-odd per cent of people in UK)