JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>findmusic</title>
</head>

<body onload="timer()">
<script type="text/javascript">
var T="",a="";
var B=new Boolean(true),sp=new Boolean(true);

document.onkeypress = function(){
    if(window.event.keyCode==32){
        if(B){
            T+="♪";
            document.getElementById('Tarea').value=T;
            a="~";;
        }
        B=false;
    }
}
document.onkeyup = function(){
    if(window.event.keyCode==32){
        a="_";
        B=true;
    }
}


function timer(){
    T+=a;
    document.getElementById('Tarea').value=T;
    setTimeout("timer()",100);
}

</script>
<textarea cols="50" rows="30" id="Tarea"></textarea>
<br />
</body>
</html>