Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
Q:1/8=144
M:6/8
K:Dmin
['A3- A z']  
X:1
L:1/8
Q:1/8=144
M:6/8
K:Dmin
 (D/E/) |"Dm" FFF"C" G>FG |"F" AA(A/B/)"A" (A/G/)(F/E/)(D/E/) |"Dm" FFF"C" G>FG |"F" A3- A2 :| d | 
"Dm" A2 A A2 G |"Dm" F2 F"A" FEd |"Dm" A2 A AAG |"Dm" F2 (A/G/)"A7" FE(D/E/) |"Dm" FFF"C" (G>F)G | 
"F" A3- A z (D/E/) |"Dm" FFF"Gm" G>FG |"A" A3- A z d |"Dm" AGF"A" (ED)"Gm"A/G/ | 
"Dm" FF"A7"E"Dm" !fermata!D2 |]  