Compose a piece of music following the specified structure and theme.
X:1
L:1/8
M:4/4
K:C
['ABA BAB caf', 'aga fga'  
X:1
L:1/8
M:4/4
K:C
 BEA Dec |[M:6/8][K:A]SOSOO .!fermata!PMTCOME | ABA BAB | caf ecB | AGA BAB | cAF F2 E | ABA BAB | 
 caf ecA | d2 B cAF | ABA A2 :: e | aga fga | gba gfe | aga fga | bge efg | a2 z (b2 g) | agf ecA | 
 d2 B cAF | ABA A2 :|  