Mendelssohn can rightly be considered one of the most important sacred music composers of the 19th century - first of all because of his many large and small vocal works of sacred music, but also because of the large number of his organ compositions. Among these, the six organ sonatas op. 65 are undoubtedly the most significant and today constitute an essential part of the repertoire for organ in general. Their composition is probably due to two English publishers who - enthusiastic about Mendelssohn's playing on the organ - commissioned several works of different sizes for this instrument. Mendelssohn then collected these six pieces composed in 1844/45 under the name of organ sonatas, but in reality, these are not strictly speaking sonatas, because these pieces are more akin to suites. In their diversity - an alternation of pieces like a choral, a lied, polyphonic and virtuoso, they offer a veritable condensed panorama of the organistic game.