Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/16
M:2/4
K:C
['(c/B/)c3{a} (g/f/)g3 |{d}', '(e/f/)e3 (Bcde){g} (f/e/)f3 (cdef) .g(efg) agfe defd']  
X:1
L:1/16
M:2/4
K:C
{d} (c/B/)c3{a} (g/f/)g3 |{d} (c/B/)c3{b} (a/g/)a3 | .e(fgf) .e(fed) | c4 C4 | 
{d} (c/B/)c3{a} (g/f/)g3 |{d} cBc2{b} aga2 | .e(fgf) .e(ga^f) | g4 g4 :: (GABc){e} (d/c/)d3 | 
 (ABcd){f} (e/f/)e3 | (Bcde){g} (f/e/)f3 | (cdef) .g(efg) | agfe defd |{^f} g4 g4 | fedc BcdB | 
 c4 C4 :|  