Sergei Rachmaninov's setting of the Divine Liturgy of St John Chrysostom - Eastern Christianity's common Eucharistic service liturgy - is regarded as one of the great cornerstones of 20th-century sacred music. This work of symphonic proportions was composed in the summer of 1910, in less than three weeks. After its completion, Rachmaninov wrote to a friend that he had been carried away by the project and that it had been a long time since he had written music with such pleasure. The outcome was judged by contemporary church officials as "...absolutely wonderful, even too beautiful... it is not church music."