The Dientzenhofer family finished St Nicholas Church in 1755, crowning Malá Strana with a dome that Johann Lukas von Hildebrandt envied. Christoph and Kilian Ignaz worked forty years to vault seventy metres of ceiling frescoes, install the pipe organ Mozart later played, and carve limestone cherubs whose gilt still catches afternoon light through south-facing clerestory windows. The Jesuit order commissioned the project as a Counter-Reformation statement, pouring Bohemian silver into stucco and marble to rival Saint Peter's in Rome. When Emperor Joseph II dissolved the order in 1787, the church passed to secular clergy, then fell silent under communist rule. The state used the bell tower as a surveillance post, aiming radio equipment at Western embassies across Malostranské náměstí until 1989. Today St Nicholas Church Concert Prague programs anchor the city's classical calendar. The nave's elliptical geometry amplifies strings without electronic assistance, a trick of Baroque mathematics that places every seat within twelve metres of the chancel. Ensembles perform under Jan Lukas Kracker's Celebration of the Holy Trinity, a trompe-l'oeil fresco spanning fifteen hundred square metres where painted saints tumble toward real architecture. The Royal Czech Orchestra schedules Vivaldi's Four Seasons and Bach's Brandenburg Concertos on alternating evenings, often pairing violinists trained at the Prague Conservatory with guest soloists from Vienna. Performances begin at eighteen hundred hours, timed so the final movement coincides with the setting sun's amber glow through western rose windows. The organ remains the church's centrepiece. František Xaver Griebl built it in 1746, installing four thousand pipes across three manuals and a pedal board that stretches two metres. Mozart tested the instrument during his 1787 Prague visit, composing Don Giovanni's overture in a house three streets east. The console's gilded casework survived both world wars, though Soviet officers once requisitioned the copper pipes for ammunition. A 1980s restoration by Czech craftsmen returned the original voicing, calibrating each rank to the nave's natural reverberation. Organists now perform monthly recitals showcasing Buxtehude and Pachelbel, their bass notes vibrating limestone columns that predate the United States. St Nicholas Church concert tickets grant access to the nave floor and choir loft, though the bell tower remains separate. The 150 CZK conservation fee supports ongoing restoration of exterior statuary, where acid rain has eroded sandstone apostles. Concerts run year-round, pausing only for Christmas Mass and Easter services. Acoustics peak in autumn and winter when heating systems remain off and humidity stabilizes the wooden soundboard.