(HUDSON, N.Y.) – Ecuadorian-Floridian pop experimentalist Roberto Carlos Lange, a new generation’s answer to Tom Zé, performs his gauzy electronic soundscapes under the nom-de-band Helado Negro at Club Helsinki in Hudson, N.Y., on Saturday, July 30, at 9 p.m. Helado Negro’s alternate universe features lilting melodies, purred Spanish lyrics and beats that dance from tranquil…