Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:6/8
K:Bb
['F>GA Bcd efe dcB', 'cde cde']  
X:1
L:1/8
M:6/8
K:Bb
"^A" F>GA Bcd | efe dcB | e2 c f2 e | c2 B AGF | F>GA Bcd | efe dcB | edc cfe | dcB B3 || 
"^B" cde cde | cde f3 | fgf fgf | b2 d dcB | F>GA Bcd | efe dcB | edc cfe | dcB B3 ||  