Orchestral percussion as trivial or unimportant simply because, to the untrained eye (or ear), they seem easy to play. The truth is, however, that auxiliary percussion often requires the most use of extended techniques and that the parts for these instruments are frequently the most difficult. Other auxiliary percussion instruments include: Crash cymbals have been used in an orchestral setting since the time of Mozart, when he adopted their sound from traditional Turkish bands to be used in his opera "Abduction from the Seraglio". Since then, crash cymbals have become one of the most written for percussion instruments in classical music and
Persian Letters texts and renewed perspectives. Particularly important were the extensively annotated edition by Paul Vernière and the research of Robert Shackleton on Muslim chronology; also studies by Roger Laufer, Pauline Kra and Roger Mercier, which put new focus on the work’s unity and integrated the seraglio into its overall meaning. Others who have followed have looked into the ramifications of epistolary form, the structure and meaning of the seraglio, Usbek’s contradictions. Beginning about 1970 it is religion (Kra) and especially politics (Ehrard, Goulemot, Benrekassa) which predominate in studies on "Lettres persanes", with a progressive return to the role of the seraglio