Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:C
['e f', 'AFA AFA', 'BAB dfg a3 baf', 'def fef', 'Add fdd']  
X:1
L:1/8
M:4/4
K:C
[M:6/8][K:D] f Beaac ue e f e f (ucvued)[Q:1/8=160] dB || AFA AFA | BGB BdB | AFA AFA | 
 gf/e/d BdB | AFA AFA | BGB BAB | def afe | fdB BAB :| dfg a3 | baf gfe | def afe | fdB BAB | 
 dfg a3 | baf a2 f | g3 faf | edB BAB :| def fef | fef fef | def fef | edB BAB | def fef | 
 fef fed | faf gfe | fdB BAB :| Add fdd | edd fdd | Add fdd | edB BAB | Add fdd | edd fdd | 
 faf gfe | fdB BAB :|  