Also E Major (Ionian), F# Dorian
C# Natural minor (Aeolian): C# D# E F# G# A B. Formula 1 2 ♭3 4 5 ♭6 ♭7. Same notes as E Major (Ionian), F# Dorian, G# Phrygian. The natural minor scale: sad and serious, the basis of minor keys in rock, pop and classical music.