Music
The game has nine songs. Two square waves play the tune and the harmony, and the triangle wave plays the bass. Only the title, the overworld, and the ending have drums, played on the noise channel. 101Leafy researched the game and timed each song the way the NES plays it: the length of one-shots, and the opening and loop of songs that repeat.
Title
On the title screen and the story that scrolls up after it.
The loop is 1:19.9 long and starts from the top. Drums on the noise channel.
Overworld
On the overworld in both quests.
A 6.4 s opening, then a 31.9 s loop. Drums on the noise channel.
Level 9
In Level 9, Ganon's labyrinth on Death Mountain.
The loop is 22.4 s long and starts from the top.
Ending
Over the ending and the staff roll. The Game Text page has the words.
A 31.9 s opening, then a 31.9 s loop. Drums on the noise channel.