A teen couldn’t find her mom’s 30-year-old demo tape. The internet stepped in.

The long-lost demo tape had always held a certain mythos in Charlotte Astor’s imagination. For years, the Cherry Hill teen had heard stories about it, recorded about 30 years ago by her mother’s very loud, very short-lived, teenage hardcore band, Seed. Shannon Astor, now 47, had been a vocalist for the group, just 14 or 15 years old, at a time when female representation within the genre was ...