Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/4=120
M:6/8
K:D
['(f/g/) (a>b)g (f>ge) (dc).d (ec).A (A>BA) (Adc)', 'e2 (f/g/) (a>bg) (f>ge) dcd ecA ABc', '(dg).b .b(ag)', '(afd) (gab) (bag) (fga) (afd) (Bgf) (edc)']  
X:1
L:1/8
Q:1/4=120
M:6/8
K:D
"^Cheerfully" (f/g/) | (a>b)g (f>ge) | (dc).d (ec).A | (A>BA) (Adc) | (Bgf) e2 || (f/g/) | 
 (a>bg) (f>ge) | dcd ecA | ABc deg | fge d2 |] | d | (dg).b .b(ag) | (df).a .a(fd) | 
 (dg).b .b(ag) | (d2 f) (afd) || (gab) (bag) | (fga) (afd) | (Bgf) (edc) | d3 d2 |]  