Using the provided alphabet sequence and motif, develop a unique musical composition.
X:1
L:1/8
Q:1/2=100
M:3/2
K:C
['d3 B G2 B2', 'f4 defd', 'd2 G2 f2 B2', 'B2 c2 g2 c4']  
X:1
L:1/8
Q:1/2=100
M:3/2
K:C
 C |[K:Gdor]"^... When I Had Ye""^tr" Td2 (ef) gfed f2 B2 | d2 g2 fdcB f4 |"^u" d2 ef gfed f2 B2 | 
 c2 g2 c4 f4 ||"^undotted in MS" d3 B G2 B2 f2 B2 | d3 B G2 B2 f4 | d3 B G2 B2 f2 B2 | 
 c2 g2 c4 f4 :: defd efge defd | BcdB defd f4 | defd efge defd | c2 g2 c4 g4 :: d2 G2 f2 B2 g2 B2 | 
 fdcd fdcB f4 | d2 G2 f2 B2 g2 B2 | c2 g2 c4 g4 :|  