Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
Q:1/4=112
M:4/4
K:G
['D GBdg dB B2 DFAc BG G2', 'dDD B E^GBd- dc/B/ ca DFAc- cB/A/']  
X:1
L:1/8
Q:1/4=112
M:4/4
K:G
 D | GBdg dB B2 | DFAc BG G2 | GBdg fdag | fded/^c/ | dDD :: B | E^GBd- dc/B/ ca | DFAc- cB/A/ Bc | 
 dgdc/B/ cacB/A/ | BGAG/F/ GG,G, :|  