Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/4=144
M:7/8
K:Dmin
['[Ac][GB][FA] [Ac][GB] [FA]2', '[GB]2 [FA]']  
X:1
L:1/8
Q:1/4=144
M:7/8
K:Dmin
"^instr:" |:"Dm" [Ac][GB][FA] [Ac][GB] [FA]2 |"Gm" [GB]3- [GB]4 | 
"C7" [GB][Ac][Bd] [Bd][Ac] [Ac][GB] |"F" [Ac]3- [Ac]4 |"Dm" [Ac][GB][FA] [Ac][GB] [FA]2 | 
"Gm" [GB]3- [GB]2 [GB][FA] |"A7" [EG]z[Ac] [Ac][GB] [FA][EG] |1"Dm" [DF]3 [DF][EG] [FA][GB] :|2 
"Dm" [DF]3- [DF] z z2 ||"^vocal:" |]"Dm" DAA A2 A2 |"Gm" B2 A (G>A GF) |"C" EGG G2 G2 | 
"F" A2 G (F>G FE) |"Dm" DFF F2 F2 |"Gm" G2 F (E>F ED) |"A7" ^C2 D E2 F2 |"Gm" BBA"A7" A4 | 
"Dm" [DF][Ac][Ac] [Ac]2 [Ac]2 |"Gm" [Bd]2 [Ac] ([GB]>[Ac] [GB][FA]) | 
"C" [EG][GB][GB]"C7" [GB]2 [GB]2 |"F" [Ac]2 [GB]"A7" ([FA]>[GB] [FA][EG]) | 
"Dm" [DF][FA][FA] [FA]2 [FA]2 |"Gm" [GB]2 [FA] ([EG]>[FA] [EG][DF]) |"A7" [^CE]2 [DF] [EG]2 [GB]2 | 
 [FA] [EG]2"Dm" [DF]4 |]  