When w.
a. mozart moved to vienna in 1781, his piano concerts provided him with the ideal vehicle for impressing the emperor because select one:
a. audiences marveled at mozart's virtuosity at the keyboard and his ingenuity as a composer.
b. concertos were the only style of music allowed in the court.
c. mozart was able to find skilled players to perform his piano solos.
d. the emperor was quite easy to impress?