There are a lot of swirling sounds within Bombadil’s Tarpits And Canyonlands. On one end it is minimalistic — stripped to its most basic components, “Sad Birthday” is piano and percussion with a slew of vocalists. But it’s not minimal, as even two instruments can create a sound all-encompassing. Add the collective of vocalists and precisely placed hand claps and the result is a sound much like that of Slaraffenland. But Bombadil cannot be limited to mere comparisons — the light instrumentation and experimental folk sounds …