Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
M:4/4
K:Gmin
['', 'DFBc dBgf (3ecA (3ecA a2 ag f=e^dc', '', 'bg^fg ec^Bc ^cd^de']  
X:1
L:1/8
M:4/4
K:Gmin
[K:Bb]|: FE | DFBc dBgf | (3ecA (3ecA a2 ag | f=e^dc Aagf | =efgf (3_ecB (3AFE | DFBc dBgf | 
 (3ecA (3ecA a2 ag | f=e^dc AagA | (3BAB (3cBA B2 ::[K:F] cB |: Acdc afef | dBdf bg^fg | 
 ec^Bc ^cd^de | (3gfe (3fed c2 cB | Acdc afef | dBdf bg^fg | ec^Bc ^cd^de | (3fgf (3efg f2 :|  