On a hillside in the small town of Erfurt, (west of Leipzig), Germany, stand two (roughly) fourteenth century churches: The St. Severikirche (the older of the two), and the Cathedral, where Martin Luther was ordained in 1507. Each of the churches features a number of bells, including the Gloriosa bell (cast 1497) and silver bells of the Cathedral, and the Osanna bell in the Severikirche. It is on the themes of these bells that Cathedral organist Silvius von Kessel improvises. von Kessel improvises on the Cathedral's 1992 Hauptorgel and the 1963 Chororgel, (both built by Alexander Schuke), and the 1930 Klais organ at the Severikirche. Gloriosa und Orgelimprovisation The Gloriosa bell and main and choir organs of the Cathedral Osanna von St. Severi, Silberglocken des Domes (b0, des2, as2, b2) und Orgelimprovisation The Osanna bell at St. Severi, the silver bells of the Cathedral, and the organ of the Severikirche Der Halbton (a0 - b0) und Orgelimprovisation One bell each from the Catheral and Severikirche, and the main and choir organs of the Cathedral Salve Regina (g0, h0, d1, e1) und Orgelimprovisation Three bells from the Cathedral, one bell from the Severikirche, and the main and choir organs of the Cathedral Molldreiklang mit Unterquart (e0, a0, c1, e1) und Orgelimprovisation Cathedral bells, organ of the Severikirche Der Quartsextakkord (g0, c1, e1 und Orgelimprovisation Bells and Main organ of the Cathedral Historischer Bestand von St. Severi (ais0, b0, dis1) und Orgelimprovisation Organ and bells of the Severikirche Phrygische Reihenfolge (e0, g0, a0, h0, c1, d1, e1) und Orgelimprovisation Cathedral bells and organ and one bell of Severikirche Organ solo - Improvisation über das Thema der Pasacalle de Primer Tono von Juan Cabanilles Main and choir organs of the Cathedral. Gloriosa solo