There’s “The Big Machine” and “The Little Machine,” according to Lindsey Buckingham, the creative force behind the juggernaut edition of Fleetwood Mac. No need to identify the Big Machine. The Little Machine is his humble description of his solo career, which is heating up as the weather cools. His first self-released album, Seeds We Sow, dropped on Sept. 6, three days before he kicked off a 31-city North American tour in Reno, Nevada.