BEEP - Beep the speaker

 Purpose:    Beep the speaker or play simple music. 
             
 Format:     BEEP [frequency duration ...] 
             
             frequency :  The beep frequency in Hertz (cycles per second). 
             
             duration :  The beep length in 1/18th second intervals. 
 

 Usage 

 BEEP generates a sound through your computer's speaker.  It is normally 
 used in batch files to signal that an operation has been completed, or 
 that the computer needs attention. 

 Because BEEP allows you to specify the frequency and duration of the 
 sound, you can also use it to play simple music or to create different 
 kinds of signals for the user. 

 You can include as many frequency and duration pairs as you wish. No 
 sound will be generated for frequencies less than 20 Hz, allowing you to 
 use BEEP as a way to create short delays.  The default value for 
 frequency is 440 Hz; the default value for duration is 2. 

 This batch file fragment runs a program called DEMO, then plays a few 
 notes and waits for you to press a key: 

 
         demo & beep 440 4  600 2  1040 6
         pause Finished with the demo - hit a key...
 

 The following table gives the frequency values for a five octave range 
 (middle C is 262 Hz): 

 
         +--------+-------+-------+-------+--------+-------+
         | C      |  131  |  262  |  523  |  1046  |  2093 |
         | C#/Db  |  139  |  277  |  554  |  1108  |  2217 |
         | D      |  147  |  294  |  587  |  1175  |  2349 |
         | D#/Eb  |  156  |  311  |  622  |  1244  |  2489 |
         | E      |  165  |  330  |  659  |  1318  |  2637 |
         | F      |  175  |  349  |  698  |  1397  |  2794 |
         | F#/Gb  |  185  |  370  |  740  |  1480  |  2960 |
         | G      |  196  |  392  |  784  |  1568  |  3136 |
         | G#/Ab  |  208  |  415  |  831  |  1662  |  3322 |
         | A      |  220  |  440  |  880  |  1760  |  3520 |
         | A#/Bb  |  233  |  466  |  932  |  1866  |  3729 |
         | B      |  248  |  494  |  988  |  1973  |  3951 |
         +--------+-------+-------+-------+--------+-------+