Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/16
M:2/4
K:F
['AcAFGBGE F4']  
X:1
L:1/16
M:2/4
K:F
 FA | c2c2cfAc | B2G2z2G2 | AcAFGBGE | F4 z2 FA | c2c2cfAc | B2G2z2G2 | AcAFGBGE | F4 z2 G2 | 
 A2c2fcBA | A2G2z2FG | A2c2fcBA | A2G2z2FA | c2c2cfAc | B2G2z2B2 | AcAFGBGE | F4 z2 |]  