Generate a piece of music.  
X:1
T:Music21 Fragment
C:Music21
L:1/4
M:3/4
I:linebreak $
K:F
V:1 treble 
V:1
 C | F E G/F/ | E C C | F G/A/ B | c2 c | B A G | F E F | G F/E/ D | C2 A/B/ | c A/B/ c | %10
 B G A/B/ | A F G | C3/2 D/ _E/C/ | F3/2 G/ A | B/A/ G F | E F2- | F2 z |[M:3/4] z2 C | %18
 F F (3G/A/B/ | c c c | B A G | F/E/ C C | F F (3G/A/B/ | c c c | B A G | F2 A/B/ | c A/B/ c | %27
 B G A/B/ | A F G | C3/2 D/ _E/C/ | F3/2 G/ A | B/A/ G F | E F2- | F2 z || %34  