Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/4=100
M:2/4
K:D
['dB BB TFB', '', 'af e/c/A/c/']  
X:1
L:1/8
Q:1/4=100
M:2/4
K:D
 (B/c/) | dB BB | TFB B/c/d/B/ | cA AA | A/B/c/d/ ed/c/ | dB BB | TFB Bd/e/ | f>g fe | dB B :| z |: 
 f>g af | e/c/A/c/ ec | d>e Tf>e | d/c/B/A/ B/c/d/e/ | Tf>g af | e/c/A/c/ ed/e/ | f>g fe | dB B :|  