What's with the ladies in the green hats? That is just...odd. They are clearly cougars before the term was even introduced. Oh, well, on to the background:
The opera was the culmination of a period of increasing involvement by Mozart with Schikaneder's theatrical troupe, which since 1789 had been the resident company at the Theater auf der Wieden. Mozart was a close friend of one of the singer-composers of the troupe, tenor Benedikt Schack (the first Tamino), and had contributed to the compositions of the troupe, which were often collaboratively written.
http://en.wikipedia.org/...
Also from wiki:
Mozart evidently wrote keeping in mind the skills of the singers intended for the premiere, which included both virtuosi and ordinary comic actors asked to sing for the occasion. Thus, the vocal lines for Papageno—sung by Schikaneder himself—and Monostatos (Johann Joseph Nouseul) are often stated first in the strings so the singer can find his pitch, and are frequently doubled by instruments. In contrast, Mozart's sister-in-law Josepha Hofer, who premiered the role of the Queen of the Night, evidently needed little such help: this role is famous for its difficulty. In ensembles, Mozart skillfully combined voices of different ability levels.