Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/16
M:2/4
K:A
['ABcd ecea ecBA fedc', 'ecea fdfa fdfa fedc'  
X:1
L:1/16
M:2/4
K:A
 (3(uEFG) | vA2A2 ABcd | ecea ecBA | fedc dcBA | GABc .B2(3(EFG) | A2A2 ABcd | ecea ecBA | 
 fedc BAGB | A2A2A2 :: (ucd) | vecea ecea | fdfa fdfa | fedc dcBA | GABc B2(ucd) | ecea ecea | 
 fdfa fdfa | fedc BAGB | A2A2A2 :|  