Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
Q:1/4=120
M:3/4
K:D
['|({c} B2', '(d>c) (.B/.c/.d/.e/) (d>c) |{c} B2 (AF) (E>D)', 'd2 D2']  
X:1
L:1/8
Q:1/4=120
M:3/4
K:D
"^Mournful" (d>c) | (d2 D2) (d>c) |({c} B2 A2) (d>A) |({c} B2 (AF)) (E>D) | D4 || (d>c) | 
 d2 D2 (d>c) | (.B/.c/.d/.e/) !fermata!f2 (d>c) |{c} B2 (AF) (E>D) | D4 |] | (F>G) | (A>B) d2 f>e | 
 d2 D2 d>c |({c} B2 A>F) (A>Bc/) | d4 || (f>e) | d2 D2 (d>c) |({c} B2 A2) (d>A) | 
{c} B2 (AF) (E>D) | D4 |]  