well, hans zimmer wrote the score for prince of egypt (the background music during the burning bush sequence is honestly the best thing i've ever heard in a movie ever). he's done the music for a bazillion other movies. some of the most memorable scores are the lion king (a collaboration with elton john), muppet treasure island, pirates of the caribbean, the davinci code, angels & demons, the dark night, sherlock holmes, inception...
anyway, the lighter stuff from prince of egypt, like "heaven's eyes," is sort of like the happy-go-lucky songs in "muppet treasure island," even though the muppet songs are pretty silly in comparison. but when it comes to "when you believe," the closest i can think of would be the slower, sadder instrumentals from "lion king" and "angels & demons."
i hope this is helpful, even though it's only material from one composer : )