async function mpFetchAsync (url) {
    let response = await fetch(url);
    let data = await response.json();

    return data;
}

const trackList = await mpFetchAsync("/audio");
let trackSelector = document.getElementById("mp_tracks");

trackList.forEach((track) => {
    let option = document.createElement("option");
    option.text = track;

    trackSelector.add(option, 0);
});