Recreate a melody by ear

[tomatosauce]

Hello there guys.

I have been trying to find a song from this video for a quite a while now -

and it seems like it has been written just for a purpose of that video. I would like to recreate this video for a school assignment using real footage, however, I am missing that melody. Therefore, I would like to ask two things:

a) Would there be anyone able to recreate this melody by ear and make it a mp3 / flac / whatever file? I would be able to donate up to 10€ if needed.

b) I would also like to ask for few recommendations of similar melodies. I know some Ludovico Einaudi's stuff, however none of them fit.

Thank you very much