Forty Hours' Devotion, called Quarant' Ore or written in one word Quarantore, is a Roman Catholic exercise of devotion in which continuous prayer is made for forty hours before the Blessed Sacrament exposed. It commonly occurs in a succession of churches, with one finishing prayers at the same time as the next takes it up.wiki
…From this background material Handel made something completely new, with rich, unusual sound effects in the strings. Banzo's group Al Ayre Español, which does not at all restrict itself to Spanish music, catches this kind of unusual moment quite vividly. It's a specialist group of the best kind, the kind that aims at general audiences and puts across fairly arcane material by dint of sheer musicality. An ideal choice for those who want to get deeper into how Handel's London audiences heard his music.