Also, even a fugue with an ordinary subject can rely on strings of repeated notes, as it happens, for example, in magnificat fugue octavi toni No. 12:  Pachelbel's apparent affinity for variation form is evident from his organ works that explore the genre: chaconnes, chorale variations and several sets of arias with variations. The six chaconnes, together with Buxtehude's ostinato organ works, represent a shift from the older chaconne style: they completely abandon the dance idiom, introduce contrapuntal density, employ miscellaneous chorale improvisation techniques, and, most importantly, give the bass line much thematic significance for the development of the piece. Pachelbel's chaconnes are distinctly south German in style; the duple meter C major chaconne (possibly an early work) is reminiscent of Kerll's D minor passacaglia. The remaining five works are all in triple meter and display a wide variety of moods and techniques, concentrating on melodic content (as opposed to the emphasis on harmonic complexity and virtuosity in Buxtehude's chaconnes). The ostinato bass is not necessarily repeated unaltered throughout the piece and is sometimes subjected to minor alterations and ornamentation. The D major, D minor and F minor chaconnes are among Pachelbel's most well-known organ pieces, and the latter is often cited as his best organ work. In 1699 Pachelbel published "Hexachordum Apollinis" (the title is a reference to Apollo's lyre), a collection of six variations set in different keys. It is dedicated to composers Ferdinand Tobias Richter (a friend from the Vienna years) and Dieterich Buxtehude. Each set follows the "aria and variations" model, arias numbered "Aria prima" through "Aria sexta" ("first" through "sixth"). The final piece, which is also the most well-known today, is subtitled "Aria Sebaldina", a reference to St. Sebaldus Church where Pachelbel worked at the time. Most of the variations are in common time, with Aria Sebaldina and its variations being the only notable exceptions–they are in 3/4 time. The pieces explore a wide range of variation techniques. Pachelbel's other variation sets include a few arias and an arietta (a short aria) with variations and a few pieces designated as chorale variations.