When I was 14 or so, the only famous Allen I knew (though his name was spelled slightly differently from mine) was Allen Lanier, and based on that, I became attuned to his contributions to the Blue Öyster Cult and perked up to see his name mentioned on John Cale, Patti Smith Group and Jim Carroll Band records. He was an Allen who rocked, so maybe I could too! I haven't heard much about him in years - he retired from the BOC awhile back - but 66 is far too young to die.
This reminds me that 66 is also the age that a Ouija board once told me that I would die. Say it ain't so, Ouija! And rest in peace, Allen Lanier.