found the song i was looking for- i loved it !!
the theme is when brothers have friendship
http://alvin.wikia.com/wiki/Not_Letting_You_Go

for more great chipmunk episodes there have been several series'
http://alvin.wikia.com/wiki/List_of_Alvin_and_the_Chipmunks_episodes

a newer series with songs that i recommend
http://alvin.wikia.com/wiki/ALVINNN!!!_and_The_Chipmunks
http://alvin.wikia.com/wiki/List_of_Alvin_and_the_Chipmunks_episodes#ALVINNN.21.21.21_and_The_Chipmunks_.282015.29
and specifically the following two great songs
!!
http://alvin.wikia.com/wiki/I_Belong
http://alvin.wikia.com/wiki/Not_Letting_You_Go