"Great Big Book of Holidays" is a song sung by Bill Quackers and Mejax Webster in the Season 2 episode "Pumpkin Caroling: Part 1 ", right after Uncle Lamb consults the said book. It's a parody of the song "Great Big Book of Everything" from the 2001 Playhouse Disney series, Stanley.
Bill and Mejax: It's The Great Big Book of Holidays
With holidays inside
All the pumpkin carols
Are in this perfect guide
So we hope that you all have a very happy Halloween.