To add music in your game, there are several options you can choose from:
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Get the license for professional music. In this case you would need to pay to use music that is already made, but its cheaper. You can find a lot of creators on sites like Youtube, where they post a sample of their work, and instructions on how to get a license. It might help if you make a search and include words like “theme” or “background music”.
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Pay someone to make a track for you. For this, you would need to search on the right website (including on this one) for people that make music. Assuming this works similar to making visual arts, you would pay them a fee, explain what kind of track you are looking for, and that person would make a track for you. This is usually more expensive, but results in unique tracks for you game.
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Search online for tracks with an open license, that you can use on commercial projects without limitations. My personal favourite is FreeSound, but keep in mind each track has its own license, not everything is allowed for commercial use.
Whichever option you use has its own ups and downs. If budget is tight, you can always experiment making your own music, which means you can use it on multiple projects without limitations or paying anyone.