RTTTL (Ringing Tone Text Transfer Language AKA NokRing)
used by cellular phones (Nokia) to get ringtones by SMS

<ringing-tones-text-transfer-language> := <name> <sep> [<defaults>] <sep> <note-command>+
<name> := <char>+ ; maximum name length 11 characters
<sep> := ":"
 
<defaults> := 
<def-note-duration> |
<def-note-scale> | 
<def-beats> |
<def-volume> |
<def-style>
<def-note-duration> := "d=" <duration>
<def-note-scale> := "o=" <scale> 
<def-beats> := "b=" <beats-per-minute>
<def-volume> := "v=" <volume>
<def-style> := "s=" <style>
<beats-per-minute> := 25,28,...,900 ; decimal value
<volume> := 0..15 ; 0 - no tone, 15 - maximal volume, decimal value
; If not specified, defaults are
; 4 = duration
; 5 = scale 
; 63 = beats-per-minute
; 7 = volume
; 1 = style
<style> := 1 | ; normal
2 | ; continuous
3 ; staccato
<note-command> := [<duration>] <note> [<scale>] [<special-duration>] <delimiter>
<duration> :=
"1" | ; Full 1/1 note
"2" | ; 1/2 note
"4" | ; 1/4 note
"8" | ; 1/8 note
"16" | ; 1/16 note
"32" | ; 1/32 note
 
<note> :=
"P" | ; pause
"C" |
"C#" |
"D" |
"D#" |
"E" |
"F" |
"F#" |
"G" |
"G#" |
"A" |
"A#" |
"B" |
"H" 
<scale> :=
"4" | ; Note A is 440Hz
"5" | ; Note A is 880Hz
"6" | ; Note A is 1.76 kHz
"7" ; Note A is 3.52 kHz
<special-duration> :=
"." | ; Dotted note
";" | ; Double dotted note
"&" ; 2/3 length
<delimiter> := ","