在与外界声音隔绝之后，贝多芬开始用“心”来作曲。

In with the outside world after the sound isolation, Beethoven began to use "heart" to compose.

youdao

As I say in the textbook there, the beginning of the Beethoven Fifth is something like a musical punch in the nose.

正如我在课本里所说的,听到贝多芬的第五交响曲开始乐段,就像有人用音乐,在你鼻子上猛击了一拳

耶鲁公开课 - 聆听音乐课程节选