Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/2
K:Dphr
['^F2 G4', 'F2 G2 G2 cBAG ^F2']  
X:1
L:1/8
M:2/2
K:Dphr
"D" DE^FG ABAG | ^F2 FD"Gm" G4 |"D" A2 A2 cBAG | ^F2 FD"Gm" G4 |"D" DE^FG ABAG | ^F2 FD"Gm" G4 | 
"D" ^F2 F2"Cm" EDEC |"D" D4 z2 ::"F" [FA]2 |"Bb" Bc d4 d2 |"F" cdcA F4 |"F7" FGAB cdec | 
"Bb" d2 de"D" dcBA |"Gm" GA B4 B2 |"D" ABA^F D4 | DE^FG ABAF |"Gm" G4 z2 :: ^FE |"D" D2 ^F2 D2 F2 | 
"Gm" G2 G2 cBAG |"D" ^F2 F2"Gm" GFGB |"D" A2 A2 d4 |"D" D2 ^F2 D2 F2 |"Gm" G2 G2 cBAG | 
"D" ^F2 F2"Cm" EDEC |"D" D4 z2 ::"F" [FA]2 |"Bb" Bc d4 d2 |"F" cdcA F4 |"F7" FGAB cdec | 
"Bb" d2 de"D" dcBA |"Gm" GA B4 B2 |"D" ABA^F D4 | DE^FG ABAF |"Gm" G4 z2 :|  