Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/4
M:3/4
K:Ab
['z2 z/ E/ A2 A (A/>E/) E/', 'A- (A F) E2 E z E', 'B (A2 F) E2 z A B', 'A F2']  
X:1
L:1/4
M:3/4
K:Ab
 z2 z/ E/ | A2 A | (A/>E/) E/ z/ A/>B/ | B2 e ||[M:2/4] B/>A/ A- | (A F) | E2 | E z | E E || 
[M:3/4] A2 B | (A2 F) | E2 z | A B e | B3 ||[M:2/4] A2 | B A | F2 | E2 |]  