They sing let Me Call You Sweetheart.
The big one is just like the scarlet singamajig except with blue eyes, heart shaped ears a green nose and a pink mouth.
The little one is atomic blue with an electric green mane, fuschia heart eyes, heart ears the same as Valentine, a purple nose and a blue-green mouth.
Big one: Cupid
Little one: Valentine's Day Sing-a-ma-jig
Sign on: Big one: "Happy Valentine's Day!" Little one: "Hi!"
Song: Both (at the same time: "Song!
Signoff: Both (Big one first): "Bye Bye!"