when do cadenzas usually occur in solo concertos
Cadenza The term cadenza often refers to a portion of a concerto in which the orchestra stops playing, leaving the soloist to play alone in free time (without a strict, regular pulse) and can be written or improvised, depending on what the composer specifies. Sometimes, the cadenza will include small parts for other instruments besides the soloist; an example is in Sergei Rachmaninoff's Piano Concerto No. 3, where a solo flute, clarinet and horn are used over rippling arpeggios in the piano. The cadenza normally occurs near the end of the first movement, though it can be at any point in a concerto. An example is Tchaikovsky's First Piano Concerto, where in the first five minutes a cadenza is used. The cadenza is usually the most elaborate and virtuosic part that the solo instrument plays during the whole piece. At the end of the cadenza, the orchestra re-enters, and generally finishes off the movement on their own, or, less often, with the solo instrument.
Josquin des Prez By far the most famous of Josquin's masses using the technique, and one of the most famous mass settings of the entire era, was the Missa pange lingua, based on the hymn by Thomas Aquinas for the Vespers of Corpus Christi. It was probably the last mass that Josquin composed.[37] This mass is an extended fantasia on the tune, using the melody in all voices and in all parts of the mass, in elaborate and ever-changing polyphony. One of the high points of the mass is the et incarnatus est section of the Credo, where the texture becomes homophonic, and the tune appears in the topmost voice; here the portion which would normally set "Sing, O my tongue, of the mystery of the divine body" is instead given the words "And he became incarnate by the Holy Ghost from the Virgin Mary, and was made man."[38]