Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/2=90
M:4/4
K:C
['C |[K:D] f ae ABcA GEGE GABG', 'edcd eaag fedf efgf edcd fdec Ad']  
X:1
L:1/8
Q:1/2=90
M:4/4
K:C
 C |[K:D] !fermata!ad f ae !>!aAFAF ABcA | GEGE GABG | AFAF Adef | gfed Ad d2 :: efge edcd | 
 eaag fedf | efgf edcd | fdec Ad d2 :|  