"Post Card Song" is a Sesame Street song from the second episode in the Camp Echo Rock saga. Everyone in the cabin is writing a postcard home during their downtime, but Big Bird doesn't know what to write. Mickey offers a simple, "I'm fine, how are you?" Similarly, Maria has some extra time between lunch and work and decides to write him one. In song, Maria writes some meaningful messages, while Big Bird contemplates the many experiences he can write about, settling on just "I am fine. How are you?" instead.