Construct a musical work that combines the specified alphabet-based pattern with the given melodic theme.
X:1
L:1/8
M:4/4
K:C
['B2 (Bc) ded^c', '(ga) bgag']  
X:1
L:1/8
M:4/4
K:C
 BEA |[M:2/2][K:G]SOSOO .!fermata!PMTuCOMGFGA B2 (Bc) | ded^c (dg) g2 | =FEFG A2 (Bc) | 
 dedc (BG) G z | GFGA B2 (Bc) | ded^c (dg)ga | (bg)af (gd)de | (=fd)cA (BG) G z || gfga g2 (ga) | 
 bgag fdde | =fefg f2 (ce) | dcBA (BG) G z | gfga g2 (ga) | bgag (fd)dg | (bg)af (gd)de | 
 (=fd)cA (BG) G z |]  