Construct a musical composition utilizing the provided motif and conforming to the specified structure.
X:1
L:1/4
M:3/4
K:none
['b2 a', 'b2 a'  
X:1
L:1/4
M:3/4
K:none
[K:G] d |"G" b2 a | g2 d |"Am" f2 e | c'2 b |"D7" b2 a | e2 f |"G" a2 g | d e/f/ g/a/ | b2 a | 
 g2 d |"Am" f2 e | c'2 b |"D7" b2 a | e2 f |"G" g3/2 g/ g | g z z ||"G" b3 |"D7" c' e f |"G" g3 | 
 g f g |"D7" a3 | a ^g a |"G" b3 | d/e/ f/g/ a | b3 |"C" c' e"D7" f |"G" g3 | g f g |"D7" a3 | 
 d b a |"G" g/g/ g g | g z z ||[K:C]"C" g2 ^f/g/ | c'2 b |"Dm/F" b2 a | a z z |"G7" f2 e/f/ | 
 a2 g |"C" (e3 | e) z z |"Dm/F" d3 | d f g |"C" c3 | c' e g |"G7" b2 a | g2 b |"C" (c'3 | 
 c') z z |]  