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I started making games in unity but I don't have too much experience in making sound and music. So if you are experienced in it and you have little time to respond to this message I would really appreciate it :)
Try Bosca Ceoil
If you haven't found one yet, I have a suggestion. Try SoundTrap. I like SoundTrap because it's free with many features (unless you want to pay), the UI is easy to read and more!
Keep on creating!