Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:6/8
K:Amix
['a>fe f>ec', 'e>AA A>ce'  
X:1
L:1/8
M:6/8
K:Amix
 A>cf e2 A | a>fe f>ec | a>fe f>ec | B>GB e>dB | A>cf e2 A | a>fe f>ec | a>Af e2 c | B>GB A2 e :: 
 e>AA A>ce | f>dd d>fa | e>AA A>ce | B>GB e>dB | e>AA A>ce | f>dd d>fa | A>ce B>Ge | A>AA A2 e :|  