I have Schroeder lined up for his first professional concert. And now Peppermint Patty says that he can't play Beethoven.

8 seconds sound clip from the Play It Again, Charlie Brown movie soundboard.

You can hear this line at 00:17:42.531 in the DVD version of the movie.

Quote context

[...]

- Haven't got any more time to talk.

- Just be sure he comes in with something good. Just as long as it isn't Beethoven.

- But he'll never... Now what am I going to do?

- That Schroeder will never agree to this.

- What's the matter?

- It's terrible.

- I have Schroeder lined up for his first professional concert. And now Peppermint Patty says that he can't play Beethoven.

- Good grief. (2)

- Hey, maybe we can get that combo together we had once before.

- Maybe we can convince Schroeder it's okay to play some modem music.

- What combo?

[...]