Compose melodious music utilizing the prescribed letter representation and integrating the given thematic element.
X:1
L:1/8
M:2/4
K:Amin
['[dB]2 [BG]2 [dB]2', '[GE]2 [EC]2 [GE]2', 'g/f/e/^d/ ef', 'c/B/A/^G/ AB', '[AF]2 [FD]2 [AF]2 [AF]2 [DB,][EC] [FDB,]2']  
X:1
L:1/8
M:2/4
K:Amin
|:"^C instruments""Dm" c'/b/a/^g/ ab | ^ga fg | f/e/d/^c/ de | ^cd"E" B2 |"Dm" f/e/d/^c/ de | 
 ^cd"E" B>A | ^G/A/B"B7" B/A/G/A/ |"E" B2 [BE]2 ::[K:A]"A" [ec][cA]"E7" [dB]2 | 
"A" [cA][AE]"E7" [BG]2 |"A" [ec][cA]"E7" [dB]2 |"A" [cA][AE]"E7" [BG]2 |"A" [ec][cA]"E7" [dB]2 | 
"A" [cA][AE]"E7" [dB]2 |"A" [cA][AE]"B7" [GE][AF] |"E7" [BGE]2 [BGE]2 ::[K:Dmin]"Gm" f/e/d/^c/ de | 
 ^cd Bc | B/A/G/^F/ GA | ^FG"A" E2 |"Gm" B/A/G/^F/ GA | ^FG"A" E>D | ^C/D/E"E7" E/D/C/D/ | 
"A" E2 [EA,]2 ::[K:D]"D" [AF][FD]"A7" [GE]2 |"D" [FD][DA,]"A7" [EC]2 |"D" [AF][FD]"A7" [GE]2 | 
"D" [FD][DA,]"A7" [EC]2 |"D" [AF][FD]"A7" [GE]2 |"D" [FD][DA,]"A7" [GE]2 | 
"D" [FD][DA,]"E7" [CA,][DB,] |"A7" [ECA,]2 [ECA,]2 :: 
[K:Bmin]"^Bb instruments""Em" d'/c'/b/^a/ bc' | ^ab ga | g/f/e/^d/ ef | ^de"F#" c2 | 
"Em" g/f/e/^d/ ef | ^de"F#" c>B | ^A/B/c"C7" c/B/A/B/ |"F#" c2 [cF]2 :: 
[K:B]"B" [fd][dB]"F#7" [ec]2 |"B" [dB][BF]"F#7" [cA]2 |"B" [fd][dB]"F#7" [ec]2 | 
"B" [dB][BF]"F#7" [cA]2 |"B" [fd][dB]"F#7" [ec]2 |"B" [dB][BF]"F#7" [ec]2 | 
"B" [dB][BF]"C7" [AF][BG] |"F#7" [cAF]2 [cAF]2 ::[K:Emin]"Am" g/f/e/^d/ ef | ^de cd | 
 c/B/A/^G/ AB | ^GA"B" F2 |"Am" c/B/A/^G/ AB | ^GA"B" F>E | ^D/E/F"F#7" F/E/D/E/ |"B" F2 [FB,]2 :: 
[K:E]"E" [BG][GE]"B7" [AF]2 |"E" [GE][EB,]"B7" [FD]2 |"E" [BG][GE]"B7" [AF]2 | 
"E" [GE][EB,]"B7" [FD]2 |"E" [BG][GE]"B7" [AF]2 |"E" [GE][EB,]"B7" [AF]2 | 
"E" [GE][EB,]"F7" [DB,][EC] |"B7" [FDB,]2 [FDB,]2 :|  