Craft a music piece according to the prescribed structure and the input theme.
X:1
L:1/8
M:2/4
K:Amin
['A>B cd eg ga eg/e/', "ab c'b"  
X:1
L:1/8
M:2/4
K:Amin
|: A>B cd | eg ga | eg/e/ dB | AB GE | A>B cd | eg ga | eg/e/ dB- |1 Bc BG :|2 BA cB |: ea ab | 
 c'b ae | fa ab | c'b ae | ^fa ab | c'b a2 |1 eg/e/ dB | BA cB :|2 ag ^f=f | ed cB ||  