Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
Q:1/4=120
M:4/4
K:Bb
['BFdc B2 d2', 'dBfe d2 f2 dBdf bfdB']  
X:1
L:1/8
Q:1/4=120
M:4/4
K:Bb
"^Lively dancing time." d/c/ | BFdc B2 d2 | BFdc B2 d2 | cFed c2 e2 | cFed c2 e2 | BFdc B2 d2 | 
 BFdc B2 d2 | cdec AFGA | B2 d2 B2 :: z2 | dBfe d2 f2 | dBdf bfdB | cFed c2 e2 | cdcB Ac f2 | 
 dBfe d2 f2 | dBdf bfdB | ABcB AFGA | B2 d2 B2 :|  