What would you change in this pattern?

Atypical scale usually consists of one of pitches. 1. rhythm 2. octave 3. key 4. series

Riddle me this: i am first in earth, second in heaven, appear two times in aweekyou can only see meonce in a year, althoughi'm in the middle of sea. what am i?

What are some of the differences between films and theatrical productions?