Who were the three most prominent composers of the Classical Period?

During the Renaissance the texture of musical compositions was mainly

Who was the composer of this piece?  

The earliest opera that has been preserved is

The practice of apiece of music having a “unity of mood” throughout was called the

The melodies of the Classical Period were

Probably the most important form of music to be developed during the Classical Period was the

Which  Middle  Ages composer wrote this piece?  

The texture of Baroque music was mainly

An oncology nurse on rotating nights sleeps poorly and feels jet-lagged. Which mechanism best explains shift-work disorder?