Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
M:3/4
K:D
['a2 a2', 'd2 d2', 'C2 D2', '']  
X:1
L:1/8
M:3/4
K:D
 a2 a2 a2 | agfgaf | g2 g2 g2 | gfefge | fa A4 | (3Bcd (3efg d2 | ef g2 f2 |{f} e6 :: e2 e2 e2 | 
 edcdec | d2 d2 d2 | dcBcdB | A2 a2 a2 | agfgaf | egfedc | d6 :|[M:3/4]"^Trio" !fermata!C2 D2 FD | 
 C2 D2 GE | C2 F2 (3FGA |{B} A4 G2 | Fd Td4 |{d} c2 BA^GA | BdcBA^G | A6 :: e4 =G2 |{A} GF F4 | 
{c} d4 F2 |{G} FE E4 | C2 D2 FD | C2 D2 GE |{G} F2 EDEC | D6 :|  