Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/4=120
M:2/4
K:G
['d (c/B/A/G/) dG Bd d(e/f/) g({ag}f/e/) a(g/f/)', "A d (c/B/A/G/) Bd c'bag (f/g/a/f/) d(e/f/)", 'd/B/d/e/ dB', 'a d B/c/d Gd Fd Ee (f/g/a)', "d d ef ga bg g(a/b/) .c'.a", 'g d d/e/d/c/ Bd ge ce fg/a/']  
X:1
L:1/8
Q:1/4=120
M:2/4
K:G
"^Spirited" d | (c/B/A/G/) dG | Bd d(e/f/) | g({ag}f/e/) a(g/f/) | gA A || | d | (c/B/A/G/) Bd | 
 c'bag | (f/g/a/f/) d(e/f/) | gG G |] e | d/B/d/e/ dB | d/B/d/e/ dB | c'a ab | c'a a || | d | 
 B/c/d Gd | Fd Ee | (f/g/a) ea | (g/f/e/f/) d |] d | ef ga | bg g(a/b/) | .c'.a .a.d' | 
 c'/b/a/b/ g || | d | d/e/d/c/ Bd | ge ce | fg/a/ df | gG G |]  