well we have officially made it to 6 minutes of this laughing kid madness. several rare xylophone and promo music variations have been discovered since version 5.0. Enjoy!
This was around March 2001 to promote FOP and Zim. Also during this time (September 4th, 2000 - July 2001) Nick would have the xylophone/engine noise or a buzzing sound or the promo's music play during the logo
SpongeBob Evolution but Wild Thornberrys and Hey Arnold, Ollie's Pack,Rugrats,Emily And Drew,Big Nate 4:44 4:46 / 0:47 In United Plankton/Nickelodeon 1999 1:07 2:37 / 2:39 and 5:05 Cloud but no is Evolution in Spongebob in Endtag / 2:48 4:17 / 4:24 Fairly oddparents promo music in Evolution Endtag Spongebob / 4:28 6:04 6:07 6:10 / 5:31 Cousin Skeeter but Nickelodeon Evolution in 2001 Endtag Taina Promo Music 3:19