Have one instrument go up while another goes down. Especially effective between the vocals and backing vocals, or between the vocals and the chord progression.
I Me Mine, Julia, Piggies, Polythene Pam, Something, There’s A Place,
also In The Light - gtr/bass outro (Led Zeppelin), Stairway To Heaven - guitar intro (Led Zeppelin), Wonder – solo (King's X)
Ticket 58: Write a descant
See the full list of songwriting tips here - Tickets To Write