Can we listen to MP3 music downloads on iOS?

Ok, so, there’s a song I wanna download, but it’s not available for download on any music sharing sites or even apps like Jamendo or SoundCloud. It’s on Newgronds but “download” is just a website for some reason, it doesn’t download, it just takes you to another site to listen to it again, when you can properly do that on Newgrounds. Although I can download it as an MP3/MP4 file, so is there a way to listen to a downloaded MP3/MP4 music file on an iPhone? If so lemme know with as many details as you can! Thanks!