the main development of organ repertoire has progressed along with that of the organ itself, leading to distinctive national styles of composition. because organs are commonly found in churches and synagogues, the organ repertoire includes a large amount of sacred music, which is accompanimental (choral anthems, congregational hymns, liturgical elements, etc.) as well as solo in nature (chorale preludes, hymn versets designed for "alternatim" use, etc.). the organ's secular repertoire includes preludes, fugues, sonatas, organ symphonies, suites, and transcriptions of orchestral works.