Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:3/4
K:A
['A<(A-(3AGF) E2 |[M:2/4] A<A E2 |[M:3/4] =G<(G-(3GFE)', 'A<A [M:3/4] A<(A-(3AGF) E2 A<A E3 E']  
X:1
L:1/8
M:3/4
K:A
 A<(A-(3AGF) E2 |[M:2/4] A<A E2 |[M:3/4] =G<(G-(3GFE) D2 | =G<G D3 || D |[M:2/4] A>B AE | A>B A<A | 
[M:3/4] A<(A-(3AGF) E2 | A<A E3 E |[M:2/4] =G>A GD | =G>A G<G |[M:3/4] =G<(G-(3GFE) D2 | =G<G D3 ||  