Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/4
M:4/4
K:F
['A G']  
X:1
L:1/4
M:4/4
K:F
 !4!F !4!F !3!E !1!D | !0!C3 !0!C | !1!D !1!D !3!E !0!C | !1!F2 !0!C2 | F F E D | C3 C | D D E C | 
 F3 z | !0!A/B/ c A/B/ c | B A G C | F2 G2 | A3 z | A/B/ c A/B/ c | B A G C | D2 E2 | F3 z | 
 G/A/ B B2 | A G F2 | G/A/ B A G | A2 c2 | G/A/ B B2 | A G F A | !1!D2 !3!E2 | !4!F3 z | 
 !4!F !4!F !3!E !1!D | !0!C3 !0!C | !1!D !1!D !3!E !0!C | !4!F2 C2 | F F E D | C3 C | D D E C | 
 F3 z |]  