Harmony is a big part of The Wailin' Jennies, but it doesn't stop there. The (mostly) Canadian folk trio is made up of three equally talented songwriters and multi-instrumentalists: Ruth Moody (guitar, banjo, accordion, bodhran) and Nicky Mehta (guitar, harmonica, ukulele, percussion) are the founding members of the group. The newest "Jennie", U.S.-born Heather Masse, joined them last year for the tour of "Firecracker", their latest release. I chatted with them by the hiss and pale light of a lantern at Camp Mather during last Fall's Strawberry Music Festival in Yosemite...