Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
Q:1/8=80
M:3/4
K:D
['F2 ED', 'dB AB']  
X:1
L:1/8
Q:1/8=80
M:3/4
K:D
"^tenderly" AGA | F2 ED EF | D2 FA BG | F2 ED GF | E3 AGA | F2 ED EF | D2 FA BG | F2 ED EF | D3 || 
 ABA | B2 de fe | d3 e fe | dB AB ee | e3 d/e/fe | dB AB dA | F2 GA BG | F2 ED EF | D6 |]  