Alt. country singer/songwriter Fred Eaglesmith has quietly pioneered his own underground festival scene GRAMMY.com Nick Krewen Who needs Deadheads when you have Fredheads? With 16 albums and two DVDs to his credit, Canadian alternative country singer/songwriter Fred Eaglesmith has built a particularly devoted following in North America, Australia and the Netherlands. And while his notoriety and album sales may not rival that of a Bruce Springsteen or a Bob Dylan,…