Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/16
M:3/4
K:Gmin
['BA^FA [Gd]4 G2fg gfaf d4 d2fg fedc', 'A2B2 B2AB cBAG A2d2 d2cd edcB']  
X:1
L:1/16
M:3/4
K:Gmin
 !turn!B4 BA^FA [Gd]4 | G2fg gfaf d4 | d2fg fedc d2>B2 | BAG^F GFGD CB,A,G, | 
 !turn!B4 BA^FA [Gd]4 | G2fg gfaf d4 | d2fg fedc d2>B2 | BA^FA A2G2 G4 :: A2B2 B2AB cBAG | 
 A2d2 d2cd edcB | A2B2 B2AB cBAG | A2d2 d2cd edcB | [Gd]2fg gfaf d4 | d2fg fedc d2>B2 | 
 BA^FA A2G2 G4 | BGBd BGBd edcB | AFAc AFAc dcBA | G^FGA BABc d4 | !turn!f4 fedc d2>B2 | 
 BA^FA A2G2 G4 :|  