Generate a piece of music. It is monophony.  
X:1
T:Music21 Fragment
C:Music21
L:1/8
Q:1/4=92
M:2/2
I:linebreak $
K:none
V:1 treble 
V:1
"^Moderato" B>cd>c B>cd>c | B2 B6 | G>AB>A G>AB>A | G8 | D>EF>E D>EF>E | D z D6 | F2 A2 c2 e2 | %7
 d2 B2 A4 | B>cd>c B>cd>c | B2 B6 | G>AB>A G>AB>A | G6 z2 | A d2 z G ^c2 z | ^F B2 z E A2 z | A8 | %15
 ^A8 | B2 =Ac- cA B2 | A c2 A B2 Ac- | c8 | e7 z | A2 GB- BG A2 | G B2 G A2 GB- | B8 | d7 z | %24
 E4 B4 | GA^FD E ^F3 | E4 B4 | d8 | ^F4 ^d4 | B^c^A^F ^G ^A3 | ^G4 ^d4 | B4 =d4 | B2 Ac- cA B2 | %33
 A c2 A B2 Ac- | c8 | e7 z | A2 GB- BG A2 | G B2 G A2 GB- | B8 | d7 z | E4 B4 | GA^FD E ^F3 | %42
 e4 ^F4 | d6 c2 | B2 Ac- cA B2 | A c2 A c2 B2 | G6 z2 | z8 | B2 Ac- cA B2 | A c2 A B2 Ac- | c8 | %51
 e7 z | A2 GB- BG A2 | G B2 G A2 GB- | B8 | d7 z | E4 B4 | GA^FD E ^F3 | E4 B4 | d8 | ^F4 ^d4 | %61
 B^c^A^F ^G ^A3 | ^G4 ^d4 | B4 =d4 | B2 Ac- cA B2 | A c2 A B2 Ac- | c8 | e7 z | A2 GB- BG A2 | %69
 G B2 G A2 GB- | B8 | d7 z | E4 B4 | GA^FD E ^F3 | e4 ^F4 | d6 c2 | B2 Ac- cA B2 | A c2 A c2 B2 | %78
 G8- | G4 z4 || %80  