Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/8=80
M:3/4
K:G
['(3def gf ga ba g2 fg af', 'gf ga ba g2 fa gf e2', 'ed cB d/c/B/A/ GF GA BA B2']  
X:1
L:1/8
Q:1/8=80
M:3/4
K:G
"^andante" (3def | gf ga ba | g2 fg af | e2 B2 de | d4 gf |"^5" ed cB AG | GF GA BA | B2 e2 e2 | 
 e4 || ef |"^9" g2 b2 b2 | b2 a2 g2 | fe de fg | a2 g2 f2 |"^13" gf ga ba | g2 fa gf | e2 B2 de | 
 d6 ||"^17" ef ed ed | BA Bd ef | gf ga ba | g2 fa gf |"^21" e2 B2 de | d4 gf | ed cB d/c/B/A/ | 
 GF GA BA |"^25" B2 ed ef | g2 ab ag | ed cB d/c/B/A/ | GF GA BA | B2 e2 e2 |"^30" e6 |]  