Create a musical composition using the given alphabetical pattern and melodic theme.
X:1
L:1/8
M:4/4
K:C
['FF FG']  
X:1
L:1/8
M:4/4
K:C
 z6 G,2 | C3/2 C/ CD E3/2 E/ DC | FF FG AA GF | EE EF GG F E/E/ |[M:2/4] DD DC | B,6 | 
 z G,/ G,/ CC | CD EE | DC FF | FG AA | G F/F/ DD | DE FF | ED z C |[M:4/4] C3/2 D/ | C6 z E | 
 FF FG A3/2 A/ (G3/2 F/) | EE EF G3/2 G/ (F3/2 E/) | DD DE FF ED |]  