"Goodnight, Dennis" is a song from "A Whale of a Song", an installment of the Playhouse Disney series, Stanley. Following a day's study of whales, Stanley sings the song to his fish, Dennis, as a lullaby, which a brief interruption from his mother telling him that it's time for bed. The song is track 24 on the album Playhouse Disney 2.
You're the best fish
I must say
We wouldn't want you any other way
Hey, you, settle down in there
It's time for bed
You're a fish, you're not a whale
But you're the best from head to tail
Goodnight, my super-singing whale of a pal.
(instrumental of whalesong)