We are not affiliated with Spreaker Studio, I'm just a professional music producer and studio engineer.  This is by far the easiest way I've ever seen to record your own voice and add custom music to it.

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They have a desktop and a mobile app.  The video above is for the desktop app, which is very similar to the mobile app. If you're going to do it on your mobile app, then we recommend downloading the music on your desktop/laptop first, then sending the song you want to yourself on your mobile device.  You want to send it in a way that you can download or save it to your mobile device. (Ask Chat GPT for instructions on how to do that if you're not familiar)