Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:G
['B2 B2 BA A2']  
X:1
L:1/8
M:4/4
K:G
|: B2 B2 BA A2 | B>AB>c d>ge>d | B2 B2 BA A2 | d2 c>A A>G G2 ::  