Classic pop songwriter, Ellie Greenwich, died Wednesday of a heart attack her niece said.

Greenwich was the co-author of some of the foremost songs of the rock and roll era including Chapel of Love, Be My Baby and Leader of the Pack.

The songwriter died of a heart attack at St. Luke's Roosevelt Hospital, where she had been admitted a few days earlier for treatment of pneumonia, according to her niece, Jessica Weiner, the Associated Press reported.

During her career as writer and producer, Greenwich also worked with such top talents as Phil Spector, Neil Diamond, Frank Sinatra, Lesley Gore, Bobby Darin, Nona Hendryx, and Cyndi Lauper.

Watch the video of Be My Baby: