DB Connectivity Error

Wasidigital 

I'm going to assume your formatting broke, and that there's actual line feeds in your code, so your comments are not what's breaking your connection.

<?php 
$servername = "localhost"; 
$username = "username"; 
$password = "password'; 
$database = "ytmp3_db"; 
// Create connection 
$conn = new mysqli($serverneme, $username, $password, $database); 
// Check connection 
if ($conn->connect_error) {
 die('Connection failed: " . $conn->connect_error);
} 
?>

It appears as though you've mixed double and single quotes on your strings. You need to pick one and stick with it.

$password = "password'

die('Connection failed:" . $conn->connect_error)