What qualities characterized the midcentury tango avant-garde period led by figures such as Astor Piazzolla? a. An emphasis on simple, straightforward harmonic and melodic qualities and performances in folkloric settings such as street festivals b. An increase in nationalistic sentiments in lyrics, particularly in the wake of Operation Condor and the ensuing political developments. c. An increasingly conservative outlook oriented toward preserving the "original" qualities of the music as developed in the porteño bar regions of Buenos Aires d. All of the above e. None of the above

c. An increasingly conservative outlook oriented toward preserving the "original" qualities of the music as developed in the porteño bar regions of Buenos Aires

Explanation:

Astor Piazzolla was an Argentine tango music composer who helped to shape and revolutionise the traditional Tango songs into something that is modern and better ones while still retaining the original qualities found in them.

He was able to infuse Jazz and Classical music into it inorder to get the new genre and was commonly known as the 'worlds's first composer of Tango music'.

classical republicanism, also known as civic humanism, is a form of republicanism  developed in the renaissance inspired by the governmental forms and writings of  classical  antiquity, especially such  classical  writers as aristotle, polybius, and cicero.

i have to go with a for this one