Our musical guests this week have one thing in common: They’re all returning to the eTown stage after many years. They include The Waifs, the dynamic Australian band headed up by sisters Vikki Thorn and Donna Simpson, and gifted singer/songwriter Jim Lauderdale, whose songs have been recorded by a Who’s Who of country stars over the years. And we’ll hear from the young founder of a nonprofit that enables other nonprofits around the country to go solar, despite their modest budgets.