Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:2/2
K:G
['fg=fd e=f d2 z cde =f2 ec', '=f2 ec dBcA', 'fffd e^deA ggge fde^c']  
X:1
L:1/8
M:2/2
K:G
 ^FGBd fg=fd | e=f d2 z cde | =f2 ec dBcA | Bcd^f gdBG | ^FGBd fg=fd | e=f d2 z cde | =f2 ec dBcA | 
 B7 g | ^fg _b2 fg=fd | e=f d2 z cde | =f2 ec dBcA | Bcd^f gdBG | ^FGBd fg=fd | e=f d2 z cde | 
 =f2 ec dBcA | B4 z cde |: =f2 ec dBcA | B^FGA Bcde | =f2 ec dBcA | Bcd^f gdBG | =f2 ec dBcA | 
 B^FGA Bcde | =f2 ec dBcA |1 B4 z cde :|2 B4 z ^FG^G || A^GA=G FDFA | dfag fffd | e^deA ggge | 
 fde^c d^FG^G | A^GA=G FDFA | dfag fffd | e^deA ggge | fde^c d^FG^G | ABAG F2 a^g | abag fffd | 
 e^deA ggge | fde^c d^FG^G | A^GA=G FDFA | dfag fffd | e^deA ggge | fde^c d=cBA ||  