I definitely think the songs should stay. After 13 ovies, watching one without songs would just feel odd.
My personal favorite song is "Beyond the Mstterious Beyond," and I have about five 2nd favorites, including but not limited to "One of a Kind," "Kids Like Us," "Things Change," "Family," and "Bestest Friends."
I wish Ducky would get some songs where she's the lead singer; the other three get so many of those (except Spike :^.^: )!