Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
M:4/4
K:C
['A>B B/A/G/F/', 'AFFB AFFB']  
X:1
L:1/8
M:4/4
K:C
[M:4/4][K:Emin] age .Mab(e ua)b(e"^Duchess" a) a dgAa ave eed[Q:1/8=100] .F/G/ | 
"^1" A>B B/A/G/F/ AFFd | A>Bdf A2 AB | A>B B/A/G/F/ dAf>e | d>B B/A/G/F/ FEE>F | 
"^5" A>B B/A/G/F/ AFFd | A>Bdf A2 Af/g/ | a>fg>e f>de>^c | dBAF FEE :|"^alternate B part" B | 
"^9" AFFB AFFB | ABdf a2 AB | AFFB AF F/A/B/^c/ | DBAF FEEB |"^13" AFFB AFFB | 
 AB/^c/ df a2- aB/^c/ | d/^c/B/A/ B/A/G/F/ G/F/E/D/ F/E/D/^C/ | e/d/^c/B/ B/A/G/F/ FEE :|  