Ticket 40: Don't Use All Seven Notes Of The Scale

Create some deliberate ambiguity by what you DON'T play. Let people assume they're hearing notes and then mess with those assumptions.

Come Together
Love You To
Rain

also

The Riddle (Steve Vai)

See also

Ticket 6: Stay Off The Root Chord
Ticket 7: Avoid Using All Three Major Chords Early In The Song
Ticket 14: Write An In-Key Melody Over Out-Of-Key Chords
Ticket 45: Change Keys Between Sections
Ticket 50: Stay Off The Root Note In The Melody
Ticket 51: Use The Mixolydian Mode
Ticket 56: Write Your Melody Over Phantom Chords

See the full list of songwriting tips here - Tickets To Write