The Cat Returns - Kaze ni Naru
Yesss!! I love this song so much <33
Let's see.. not counting MLP or anime songs or I'll be here all day
"Dreams to Dream" - An American Tail 2: Fievel Goes West
"Let Me Be Surprised" - All Dogs Go To Heaven (love all the songs from that film, but this is my favourite <3)
"Flying Dreams" - The Secret of NIMH
All the songs from Tom Sawyer (2000 version), especially "Hook, Line and Sinker", "One Dream" and.. aw heck, I love them all.
"The Girls of Rock and Roll" - The Chipmunks Adventure
Aaand if we're talking about series and not just songs from films..
"I Think I Like You" - The Angry Beavers
Nearly anything from Steven Universe, especially "Let Me Drive My Van Into Your Heart", "Strong in the Real Way" and "Be Wherever You Are". Adventure Time has some great songs too! Especially any written by Rebecca Sugar, like "Oh Fionna" and "Remember You". :B
All the songs from Over the Garden Wall, that series had an amazing soundtrack! I especially like "Langtree's Lament" :B
The theme song from the old Sylvanian Families cartoon. I don't really like the cartoon itself but the theme song is so catchy and happy, eeee~
Pretty much all of the songs from CatDog, especially the theme song <3
..haha, I'm a sucker for cartoon songs, if it wasn't obvious.
I'm prolly forgetting loads, too, these're just off the top of my head..