How do I store music so i can listen to it without an app

You can download free and DRM-free music from Tubidy. It is a kind of website or a group of websites that provides music and video services to Internet users. Because there are too many similar sites with the same name, like tubidy.mobi, tubidy.blue, tubidy.io, etc., it is called as a group of sites. Just learn more step-by-step guidance on: How to Free Download Music from Tubidy?

You can store music in MP3 format on any Samsung Galaxy phone in its Music folder two ways. First by transferring it from a PC using a USB cable. The second method is to copy the music to a Micro SD card on the PC (using an adapter). then power off the Samsung phone, insert the Micro SD card, and power it back up.Then mount the SD card, and open the folder and play the music, or copy the files to the Music folder.

Samsung has its own music app to play so you don;t need to load any app.

Take use of third party tool- Prof. DRM, it can remove drm-protection on spotify music and itunes music for converting as common drm-free format. here is link you can refer to how to use the tool https://www.leawo.org/tunescopy/remove-drm-from-spotify-music.html#t

Downloading free music? There's no legal way to do that, unless you pay monthly for a service like Spotify which I believe may do something like that.

I'd recommend you do it the way normal people do: sync music from a computer or buy it from the iTunes Store on your iPod itself.