Generate a piece of music. The title is Deirn d.  
X:1
T:Deirn d, S. 15
T:Deirn d, S. 15
C:Music21
L:1/4
M:4/4
I:linebreak $
K:F
V:1 treble 
V:1
 G G G A | A/<F/ F/D/ F3/2 x/ | F/ x7/2 | G A B D | B A G z | G G G A | A/<F/ F/D/ F3/2 x/ | %7
 F/ x7/2 | G A B D | B A G z || %10  