Write a musical work incorporating the specified theme and letter-based framework.
X:1
L:1/8
M:4/4
K:D
['B2 dA', 'e3 f d3']  
X:1
L:1/8
M:4/4
K:D
 A | B2 dA BAFA | B2 dA BAFB | AF F2 DF F2 | BAdA BDFA | B2 dA BAFA | B2 dA BAFB | A3 B defd | 
 edef d3 :| f | e3 f d3 f | edef dB A2 | e3 f d3 e | fedB ADFA | e2 df eB B2 | gB B2 defg | 
 afbf afde | fedB ADF :|  