Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:4/4
K:C
['F2 A', 'bag fed cde d3']  
X:1
L:1/8
M:4/4
K:C
[M:6/8][K:D] .abc A, | DED F2 A | d2 f ecA | G2 B F2 A | E2 F GFE | DED F2 A | d2 f ecA | 
 Bgf{f} edc | d3 d2 :| | a | a2 f d2 e | f2 g agf | g2 e c2 d | e2 f gfe | f2 d g2 e | a2 f bag | 
 fed cde | d3 d z a | agf fed | Adf afd | gfe ecA | Ace gfe | fed gfe | agf bag | fed cde | 
 d3 d2 :|  