When Alexi Erenkov and Alison Alderdice got married, Erenkov’s vows weren’t your typical declarations. “They were about our mortality,” says The Saxophones’ drummer Alison Alderdice with a bit of a grin. “The light and the dark and how this marriage will end when one of us dies…It was really romantic, though.” The couple laugh. The Saxophones — vocalist and lyricist Alexi Erenkov, drummer Alison Alderdice and bassist Richard Laws–create music that is gentle and ethereal, layered with woodwinds and rich, serenading vocals…