SOUTH BURLINGTON — On a cold Tuesday evening in South Burlington, the five members of the band Chamberlin — several of them Addison County natives — huddle together in a dimly lit room to warm up. They begin their ritual singing in a low voice, “Call… me… Neil…,” and then raise their voices higher, “Call… me… Neil….” At the top of their ranges, “Call… me… Neil…,” the door bursts open and everyone looks up.