A founding member, with his younger brother Jimmy, of controversial independent rock band The Frogs.
He was the primary percussionist for the band. Dennis was also a temporary member of The Smashing Pumpkins from 1996 to 1997, filling in on live keyboards following the death of Jonathan Melvoin.
The brothers Flemion also appeared on "Medellia of the Gray Skies," on the band's single for "Tonight, Tonight". On Adore, the brothers backed vocals for "To Sheila" and "Behold! The Night-Mare".
On July 7, 2012, Flemion drowned in a lake in Racine County, Wisconsin. He was 57.
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