After explaining that Steven, 77, forged a friendship with his ex, Liv’s mother, Bebe Buell, when Liv was age “8 or 9,” Liv said Steven arranged to meet Buell, 71, at “one of Todd’s shows” in Boston, which was “very painful for Todd.” (Rundgren, 76, was a member of the bands Nazz and Utopia, and performs as a solo artist.)