SCHINKEL_04
Or rather, his Singakademie sings. . . or something like that.

A standard basilica form sits completely within a Greek-gabled stone volume, but with a wonderful circular stepped dias for the vocalists (er, singers).  This circular form is duplicated in the barrel vaulting at the ceiling.  A Doric peristyle surrounds.  I’ve overlaid plans, sections, and elevations on one another to show the full effect.  A similar theme pervades the church design shown below.
SCHINKEL_03