Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/4
M:3/4
K:D
['B, D']  
X:1
L:1/4
M:3/4
K:D
 A F E | D3 | F2 E | D B, A, | A,3- | A,3 | B, D E | F2 G/F/ | E2 D | B,3- | B,3 | E A F | E D2 | 
 G3 | B, D B, | A,3- | A,3 | B, D E | F G E | D3- | D3 |]  