need help with small php upload file script

[MoE70]

if you have apache please try to get this script to upload mp3 files. it keeps saying invalid file what ever i do.

<?php
if (($_FILES["file"]["type"] == "audio/x-ms-wma")
|| ($_FILES["file"]["type"] == "audio/mp3")
&& ($_FILES["file"]["size"] < 20000000000))
  {
  if ($_FILES["file"]["error"] > 0)
    {
    echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
    }
  else
    {
    

    if (file_exists("upload/" . $_FILES["file"]["name"]))
      {
      echo $_FILES["file"]["name"] . " already exists. ";
      }
    else
      {
      move_uploaded_file($_FILES["file"]["tmp_name"],
      "upload/" . $_FILES["file"]["name"]);
      echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
      }
    }
  }
else
  {
  echo "Invalid file";
  }
?>