Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
M:2/4
K:Bb
['F B>cde fd z2 ffff fe/d/cc/d/ eedd']  
X:1
L:1/8
M:2/4
K:Bb
 F | B>cde | fd z2 | ffff | fe/d/cc/d/ | eedd | c2 B z | B>cdc | B/c/d/e/ff | gfed | ccB |]  