Cass McCombs is a wanderer. He’s described himself in the past as a nomad, and reviews of his early albums almost all mention him sleeping in cars, on couches, and at campsites across the United States. Before releasing his debut album a little over two decades ago, he worked dozens of odd jobs — projectionist, demolition worker, painter — and it’s difficult to say whether or for how long he’s had a fixed address in the years since. There was a period in New York and some time spent in Baltimore, intermittent stays in California, where he was born, and a spell in London. Details are difficult to pin down, mostly because McCombs has no interest in discussing them. He has become American pop music’s greatest living mystic, so it is a little strange to hear Seed Cake On Leap Year, a collection of previously unreleased songs from McCombs’s early years. Released in October by Domino Records alongside reissues of his first two full-length records, Seed Cake on Leap Year comprises 10 songs M...