Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:F
['F<F F>F A>F', 'f>g ag a/g/f/d/ cf d<f c>A{A}', 'CF A,F C>F Bd c<A', 'f>g{fg} a>g a/g/f/d/']  
X:1
L:1/8
M:4/4
K:F
 C | F<F F>F A>F Ac | d<f c>A{A} G2 G>A | F<F F>F A>F A3/2c | d<f c>A F2 F :: c | 
 f>g ag a/g/f/d/ cf | d<f c>A{A} G2 G>c | f>g ag a/g/f/d/ cf | d<f c>A{A} F2 F :: A | 
 CF A,F C>F Bd | c<A F>A{A} G2 G>A | CF A,F C>F Bd | c<A f>A F2 F :| c | f>g{fg} a>g a/g/f/d/ cf | 
 c>d f>a g2 g>a | f>g{fg} a>g a/g/f/d/ c>f | d<f c>A{A} F2 F3/2 | c/ | f>g{fg} a>g a/g/f/d/ cf | 
 c>d f>a g2 gf/g/ | a>f a/g/f/e/ f>c d<f | c>B A>G F2 F |]  