Original sentence: The series' theme song, "Those Were the Days", was presented in a unique way for a 1970s series, with O'Connor and Jean Stapleton singing the tune on camera at the start of every episode
Edited sentence: The series' famous theme song, "Those Were the Days", was presented in a unique way for a 1970s series, with O'Connor and Jean Stapleton singing the tune on camera at the start of every episode