This is a player for NSF-format Nintendo Entertainment System music files. It's written in JavaScript and should work in any major browser.
Include libgme.js and index.js in your project.
<script src="libgme/libgme.js"></script>
<script src="index.js></script>
Create a player by calling createNsfPlayer.
const nsfPlayer = createNsfPlayer(); // An audio context is created for you.
Optionally, you can pass in your own audio context.
const ctx = new AudioContext();
const nsfPlayer = createNsfPlayer(ctx);
NSF files may contain multiple tracks. Play a track by calling play and passing it the path to your NSF file and the index of the track you wish to hear. (Indexes start at 0 and go up.)
nsfPlayer.play('./songs/smb.nsf', 2);
If you just want to hear the first track, you don't have to pass an index.
nsfPlayer.play('./songs/smb.nsf');
Stop the music by calling stop.
nsfPlayer.stop();
This uses (and includes) libgme, A.K.A. Game_Music_Emu, a library for emulating video game music. I adapted it from code I found on the web at onakasuita.org/jsgme.