Film themes are written to be remembered after one hearing, which makes them good material for the ocarina. This page has every film and TV tab in the library, grouped by franchise and composer.
John Williams wrote six of them: the Star Wars main theme, the Imperial March, the Cantina Band, Hedwig's Theme from Harry Potter, the Raiders March from Indiana Jones and the theme from Jurassic Park. Hedwig's Theme first appears on a celesta, a small keyboard with a bell-like sound, and its high, thin line sits nicely on an ocarina. The Lord of the Rings has the Shire theme, which is played on a tin whistle in the films and falls under the fingers just as well on an ocarina, and Misty Mountains from The Hobbit. Disney is here with A Whole New World, Beauty and the Beast, Can You Feel the Love Tonight and Let It Go, along with He's a Pirate from Pirates of the Caribbean, My Heart Will Go On from Titanic and the Game of Thrones theme.
Some of these are harder than they sound. Fast themes like He's a Pirate need quick, light tonguing, and big orchestral tunes often use most of a 12-hole's range. Each group starts with its easiest tab.
John Williams
Theme from Jurassic Park by John Williams. Intermediate: 36 notes, C4 to C5, 1 sharp or flat, 2 big leaps.
Cantina Band by John Williams. Intermediate: 59 notes, E4 to F5, 7 sharps or flats.