Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:3/4
K:C
['B2 B2', 'A2 A cB E>F G2']  
X:1
L:1/8
M:3/4
K:C
"^A""C" G>c e2 e2 | c>e e2 e2 |"G7" f2 B2 B2 | d2 G2 G2 | B>d f2 f2 | G>B d2 d2 | B2 B2 B2 | 
"C" c2 c2 z2 ::[K:G]"^B""G" B>B Be d2 | G>G Gc B2 |"D7" B>A c2 F2 |"G" A>G B2 D2 | B>B Be d2 | 
 G>G Gc B>B |"D7" BA cB AF |"G" G2 G2"_>Teil A" z2 ::[K:F]"^C""F" A2 !>!d3 A |"C7" cB E>F G2 | 
 B2 e3 c |"F" dc F>G A2 | A2 !>!d3 A |"C7" cB E>F G2 | dc ed GA |"F" F2 F2 z2 ::"^D""Bb" B>B B4 | 
"F" A>A A4 |"C7" c>d c2 B2 |"F" A>B A>G F2 |"Bb" B>B B4 |"F" A>A A4 |"C7" c>d c>B A>G | 
"F" F2 F2 z2 :|  