If I had to rank the overworld themes of the 12 main series games. (9 since the Oracles and LA have the same overworld) (as do WW and PH, although there is a slight difference in quality there)
This means the Main overworld theme. So that means the typical Overworld, Hyrule/Termina Field, or the Great Sea. Depending on which game you are playing.
1) Oracle Series + Link's Awakening
2) Link to the Past
3) Majora's Mask
4) Adventure of Link
5) Legend of Zelda
6) Minish Cap
7) Ocarina of Time
8) Twilight Princess
9) Wind Waker
This means the Main overworld theme. So that means the typical Overworld, Hyrule/Termina Field, or the Great Sea. Depending on which game you are playing.
1) Oracle Series + Link's Awakening
2) Link to the Past
3) Majora's Mask
4) Adventure of Link
5) Legend of Zelda
6) Minish Cap
7) Ocarina of Time
8) Twilight Princess
9) Wind Waker