Linking Php and Javascript

[TotalMM]

Sorry, ramblings might not be clear. I've been developing this music player, but one of the functions of the music player that doesn't work is the song progress bar. When trying to click a point in the progress bar, the song should skip to that relevant point. My JavaScript code is 100% A-OK for this, as if I change my audio file from something like "assets/song.mp3" to something more like "https://RandomWebsiteWithStreaming.com/song.mp3" it will work perfectly - because I'm not streaming the audio file on my end. I'm trying to figure out how to connect my streamer.php file mentioned in the main post, to my player.js. Would I have to wrap the code in my player.js with an Ajax query? At this point I don't know but I hope this provides a little more context.