Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:7/8
K:D
['[Bd] [Ac]2']  
X:1
L:1/8
M:7/8
K:D
"^Instr:" |"D" [FD][GE][AF] [AF][GE] [FD]2 | [AF][BG][cA] [cA][BG] [AF]2 | 
"A" [cA][dB][ec]"E" [ec][dB] [dB]/[cA]/[dB]/[ec]/ |"A" [cA]7 |"A" [cA][dB][ec] [ec][dB] [dB][cA] | 
"A7" [cA]2 [dB] [cA][BG] [BG][AF] |"G" [BG]2 [cA]"A7" [AF][GE] [GE][FD] |"D" [FD]7 ||"^Vocal:" | 
"G" [Bd]2 [Bd] [Ac]2 [Bd]2 |"A7" [ce]2 [Bd] [Ac]2 [GB]2 |"D" [FA]2 [GB]"G" [Bd]2 [Bd][Ac] | 
"A" [Ac]7 |"G" [Bd]2 [Bd] [Ac]2 [Bd]2 |"A" [ce]2 [Bd] [Ac]2 [GB]2 |"D" [FA]3"A" [GB][FA] [EG][DF] | 
"D" [DF]7 |:"Bm" [df]2 [ce] [Bd]2 [Bd]2 |"A" [ce]2 [Bd] [Ac]4 |"G" [Bd]3"A" [Ac]2"G" [Bd]2 | 
"A" [GB][FA][GB]"D" [FA]4 |"G" [Bd]2 [Ac] [GB]2 [GB]2 |"A" [Ac]2 [GB]"D" [FA]4 | 
"A" [GB]2 [GB] [FA][GB] [EG]2 |"D" [DF]7 :|  