function Play-Notes
{
$defaultduration = 5;if($args[0] -is [int]) {$defaultduration = $args[0]}
for($i = 0;$i -lt $args.length;$i++)
 {    
    $duration = $defaultduration
    if ($i -lt $args.length-1) { if ($args[$i+1] -is [int]) {$duration = $args[$i+1] } }
    if ($args[$i] -is [string]) { play-note $args[$i] $duration }
 }
}

function Play-Note([string]$note,[int] $duration = 5)  
{  
  if (!($note -match '(\d+)')) { $note+='4' };[void]($note -match '([A-G#]{1,2})(\d+)')  
  [console]::Beep((440 * [math]::Pow([math]::pow(2,(1/12)),
    (([int] $matches[2]) - 4)* 12 + $( switch($matches[1])  
  {  'A'  { 0 }  'A#' { 1 }  'Bb' { 1 }  'B'  { 2 }  'C'  { 3 }  'C#' { 4 }  'Db' { 4 }  
     'D'  { 5 }  'D#' { 6 }  'Eb' { 6 }  'E'  { 7 }  'F'  { 8 }  'F#' { 9 }  'Gb' { 9 }  
     'G'  { 10 } 'G#' { 11 } 'Ab' { 11 }  
  }))),$duration * 100 )    
}  

PLAY-note "C#3"

play-notes A B C 20 E 10 B 10
play-notes F5 2 E5 2 D5 2 C5 2 B5 2 A5 2 G 4 F5 2 E5 2 D5 2 C5 2 B5 2 A5 2 G 4
play-notes 2 F5 E5 D5 C5 B5 A5 G 4 F5 E5 D5 C5 B5 A5 G 4
play-notes 4 F5 E5 D5 C5 B5 A5 G F5 E5 D5 C5 B5 A5 G 
play-notes Db5 Db Eb Gb Ab "C#" 6