Set below code on your button click event and you have to set only wav file.
protected void btnclick_Click(object sender, EventArgs e)
{
string path = Server.MapPath("Songs/welcome.wav");
playSound(path);
}
private void playSound(string path)
{
System.Media.SoundPlayer player =
new System.Media.SoundPlayer();
player.SoundLocation = path;
player.Load();
player.Play();
}