Let's say I am in the key of C and trying to write a simple melody over some chords on the piano.
Chord progression: I (Cmaj) IV (Fmaj) V (Gmaj) I (Cmaj)
Let's take the IV chord for instance. What's the difference between connecting the IV chord to the Lydian mode so I can use the pitches in F Lydian mode to create a melody versus just using the pitches in the key of C itself? Won't I be using the same pitches/notes anyways?
Is it not easier to just focus on the keys pitches during the progression to create a melody rather then having to think about each mode for each chord?