Two entirely distinct sets of influences were instrumental in leading musicians to experiment with the solo voice. The first of these can be traced back to the practising of individual parts in choral works as a medium of vocal cultivation. A singer practising a part of this kind by himself could not fail to notice that he used his voice with greater freedom and satisfaction than when obliged to consider only the effect of his voice in conjunction with other singers. So also would the master who was instructing him in his part. Highly significant is the fact that this discovery was made in the singing of florid music. Rather elaborate passages of the florid type were selected for vocal practice and these would naturally be adapted for bringing out the purely sensuous beauty of the voice. Florid counterpoint thus contained within itself the germs of coloratura singing. As singers began to recognize the beauties of their own individual voices, the desire naturally arose to display these beauties to others. Opportunity for vocal display was, however, lacking, as no music had ever been written for the solo voice. This difficulty was finally overcome by a singer performing only one part of a contrapuntal work and having the other parts played as an accompaniment by instrumental performers. The first solos sung in the history of European musical art were of this type. As early as 1539 a four-part madrigal was produced in this manner, the highest soprano part being sung as a solo. The fashion spread rapidly and solo singing soon began to attract the serious attention of musicians.[5] Singers were of course anxious to exhibit their voices. Polyphonic music offered them little scope in this regard, for florid writing was distributed among the various parts and it was impossible for the artists to find works which contained more than an occasional ornamental passage for any one voice. They hit naturally upon the device of adding ornaments according to their own taste and fancy to the part selected for solo performance. Kiesewetter reproduces a madrigal sung in this manner by a noted soprano singer, Vittoria Archilei, in 1589. Both the original soprano part and the same part as embellished by Archilei are reproduced here. [Illustration: _a._ Simple melody of treble part] Dalle più alte sfere dalle più alte sfere di celesti Sirene di celesti Sirene [Illustration: _b._ Melody as sung by Vittoria Archilei] Dalle più alte sfere dalle più alte sfere di celesti Sirene di celesti Sirene