The Stadtkirche St. Peter und Paul in Görlitz, founded in the 13th century and completed in 1497, features a highly reverberant space with a central nave flanked by four aisles. After a fire in 1691, a new organ was commissioned and completed in 1703 by Eugenio Casparini and his son, featuring 57 stops on 3 manuals, making it one of the largest in Silesia. The organ case, designed by Johann Conrad Büchau, included 17 golden suns functioning as a pedal cornet-mixture, known as the "Sonnenorgel."

Johann Sebastian Bach famously criticized the organ for its tough tracker touch, claiming it required the strength of a horse to play. Over time, only the Cypress-wood pipes of the Onda maris from the original Casparini organ have survived. In 1894, Schlag and Sons rebuilt the organ, and in 1928, Sauer installed an electro-pneumatic organ with 89 stops into the historical case.

Between 1980-1992, the church underwent interior restoration, and plans were made for a new organ that would respect the historical case while being suitable for a broader range of music. The Swiss company Mathis Orgelbau constructed this new organ in 1997, inspired by Casparini's baroque concept but with additional capabilities, including a swell manual.

The organ, updated in 2021, has undergone several repairs and renovations over the years:

- 1827-29: Repair and renovation by Joseph Schinke and Carl Friedrich Ferdinand Buckow.
- 1845-1847: Expansion by Friedrich Nikolaus Jahn.
- 1894: New construction by Schlag & Söhne, reusing some old registers.
- 1926-1928: Complete rebuild by W. Sauer, preserving the old casing but adding new electromechanical action and 89 registers.
- 1997: New construction by Mathis, using some Sauer wooden pipes and expanding to 64 registers.
- 2004: Reconstruction of the 'Sonnenmixtur', bringing the total to 65 registers.
- 2006: Completion of the second building phase, including swell work, bringing the total to 88 registers.
- 2021: Addition of three new pedal registers and removal of a 2-fold noise pipe, resulting in 90 registers.

Future plans for 2024 include the addition of Spanish trumpets, increasing the total to 93 registers, with an inauguration planned for Pentecost 2024.

Additionals: : II/I, III/I, IV/I, IV/II, IV/III, III/II, I-P, II-P, III-P, IV-P, Super III/P, Sub III/I, Sub III/III, EW/HW, EW/OW, EW/SW, EW/P, Crescendowalze, Tutti, Setter system with 1000 combinations per USB stick., Tremulant II, Tremulant III, Tremulant IV, Cymbelstern ("Rotating Sun"), Nachtigall, Vogel-Gesang, Tamburo 16' (death-drum), Kuckuck

https://organindex.de/index.php?title=G%C3%B6rlitz,_Peterskirche
https://www.sonusparadisi.cz/en/organs/germany/goerlitz-sonnenorgel.html