Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:6/8
K:A
['ABA cBA', 'cff f2'  
X:1
L:1/8
M:6/8
K:A
 ABA cBA | faf ecB | ABA cBA | FGA BGE | ABA cBA | faf ecA | BAB cec |1 ABA A2 E :|2 ABA A2 g || 
 agf efg | aba gfe | cff f2 e | cff f2 g | agf ece | faf ecA | BAB cec |1 ABA A2 g :|2 ABA A3 ||  