Many have tried, but absolutely nobody has been able to even come close to have the monumental global impact and success with a song for a film Celine Dion with "My Heart will Go On" and Whitney Houston with "I will always love you" had. Nobody. Granted nobody since Whitney, Celine and Mariah has appeared with a voice like THAT. I won´t give a list of names who have made songs for films but... hmm just an example is Leona Lewis when she was first having really big success and they gave her the song for Avatar (no less, the most successful film ever since Titanic). And still, it went nowhere.