Write a musical work incorporating the specified theme and letter-based framework.
X:1
L:1/4
Q:1/4=100
M:2/2
K:Bb
['d c d']  
X:1
L:1/4
Q:1/4=100
M:2/2
K:Bb
 G2 G A | B2 c2 | (d3/2 c/ B) (c/B/) | A3 F | G3/2 F/ G/A/ B | c B A2 | G2 | B2 | d d c d | 
 (c3/2 A/ G) G | A3 z | z2 z A | B B G G | A3 (B/c/) | d d B B | c3 d | (e d c d | G A B) d | 
 (c B) A2 | G4 |]  