Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:6/8
K:Bb
['A B2']  
X:1
L:1/8
M:6/8
K:Bb
 F |"Bb" B2 c d2 e |"Bb" d3"F7" c2 A |"Bb" B2 B"Eb" e2 d |"F7" c3- c2 :| z |"Eb" G2 A B2 c | 
"F7" A3 F2 f |"Bb" f2 g"F7" e2 f |"Bb" d3- d2 f |"Bb" f>ed c2 d |"Eb" e3 z2 e |"Cm" e>fe"Gm" d2 d | 
"F" c3 z2 d"^I" |"F7" c2 B c2 A |"Bb" B2 B"Eb" c>de |"Bb" f>ed"F7" c2 B |"Bb" B3- B2 |]  