“[M]usic’s most multi-faceted family dynasty has lost the lynchpin which held it together through good times and bad. Alongside her older sister Anna, McGarrigle recorded a string of highly regarded folk-music albums.” She had a famously unsuccessful marriage to fellow folk singer Loudon Wainwright III; they “had a son, Rufus, and a daughter, Martha, both of whom inherited the family musical bug, albeit in wildly divergent ways.”