The lineup of the Los Angeles, California, indie-pop quartet that dog. represented the flowering of a second generation of musical luminaries: singer/guitarist Anna Waronker was the daughter of famed producer and Warner Bros. head Lenny Waronker, while violinist Petra Haden and her sister bassist Rachel Haden were two of the triplet daughters born to jazz titan Charlie Haden. Friends since high school, the trio first began playing music together in Waronker's bedroom in the early 1990s...