ephemeral (adj.): lasting for a very short time
“The individual appears for an instant, joins the community of thought, modifies it and dies; but the species, that dies not, reaps the fruit of his ephemeral existence.”
― A.S. Byatt
Sounds like: FM Muriel
Muriel’s stint as an FM radio jockey was ephemeral because she kept insisting that they play sitar music.