Spurred on by an insatiable Argentinian crowd, Aly & Fila threw a legendary, last-minute free party at Buenos Aires' Groove, resulting in a massive open-to-close set that pushed past the eight-hour mark. This first installment captures the opening four hours, where the duo patiently builds the energy from deep progressive house and melodic trance before guiding the room into their signature euphoric, high-bpm sound.