The plaza features the statue of Beethoven in front of the post office.

detail of base
He  was born in Bonn in 1770 and lived to 1827. While Bonn is proud of him, the word is that Beethoven did not reciprocate the feeling. Franz Liszt is responsible for the statue which was erected on Beethoven's 75th birthday (Queen Victoria was in attendence). Listz contributed financially and also organised concerts to fund the statue. The four sides of the base represent four types of music: instrumental, symphonic, spiritial and opera. (Why a lyre-playing woman riding a horse that has  a woman's head and chest should represent symphonic music, is understoood on some mythology plane that is beyond me.)
detail of base
Beethoven faces a Max Plank Institute building with Jupiter and the Moon setting behind.