What notes are in each mode on C?
The examples keep C as tonic. C Ionian: C–D–E–F–G–A–B–C; C Dorian: C–D–Eb–F–G–A–Bb–C; C Phrygian: C–Db–Eb–F–G–Ab–Bb–C; C Lydian: C–D–E–F#–G–A–B–C; C Mixolydian: C–D–E–F–G–A–Bb–C; C Aeolian: C–D–Eb–F–G–Ab–Bb–C; C Locrian: C–Db–Eb–F–Gb–Ab–Bb–C. The last C repeats the tonic one octave higher.
Which scale degrees change?
Compared with major (Ionian), Dorian lowers 3 and 7; Phrygian lowers 2, 3, 6 and 7; Lydian raises 4; Mixolydian lowers 7; Aeolian lowers 3, 6 and 7; Locrian lowers 2, 3, 5, 6 and 7. These are comparisons to the same tonic, not to each mode’s relative major.
How are parallel modes different from relative modes?
Parallel examples share C as their tonic. Relative examples share a pitch collection but have different tonal centers. For instance, C Dorian and B-flat major use the same pitch classes. That relationship helps identify notes; it does not establish that a passage is in C Dorian simply because those notes appear.
Which example can I compare next?
Play C Ionian, then C Lydian. Pause on F and F-sharp and return to C after each example. Next compare the A-flat in C Aeolian with the A-natural in C Dorian. Keep the comparison short and use the note lists as your check.