Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/4
Q:1/8=100
M:3/4
K:Amin
['B A']  
X:1
L:1/4
Q:1/8=100
M:3/4
K:Amin
"^plaintive" e/^f/ | g a g | e d G | B A A | A2 B/A/ |"^5" G A B | d e d | d B A | G2 A/B/ | 
"^9" c B A | B A A/B/ | c d e | a2 g/a/ |"^13" b a g | e d G/A/ | B A A | A3 |]  