Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/4
Q:1/8=120
M:3/4
K:D
['B E E F/E/ F/A/ B', 'e e']  
X:1
L:1/4
Q:1/8=120
M:3/4
K:D
"^allegretto" B E E | F/E/ F/A/ B | A D F | A D F |"^5" B E E | F/E/ F/A/ B | d B/c/ d | A2 F || 
"^9" E e e | e f/e/ d/c/ | d e/d/ c/B/ | A F D |"^13" E e e | e f/e/ d/c/ | d B c | d2 c | 
"^17" B G/A/ B | A F/G/ A | d B/c/ d | A F D |"^21" B/A/ F/A/ B | A F A | d2 F | !fermata!D3 |]  